diff --git a/PdfForQtLib/sources/pdfdocument.cpp b/PdfForQtLib/sources/pdfdocument.cpp
index 3dcaee0..4d36e12 100644
--- a/PdfForQtLib/sources/pdfdocument.cpp
+++ b/PdfForQtLib/sources/pdfdocument.cpp
@@ -402,6 +402,16 @@ std::vector<PDFInteger> PDFDocumentDataLoaderDecorator::readIntegerArray(const P
     return std::vector<PDFInteger>();
 }
 
+PDFObjectReference PDFDocumentDataLoaderDecorator::readReference(const PDFObject& object) const
+{
+    if (object.isReference())
+    {
+        return object.getReference();
+    }
+
+    return PDFObjectReference();
+}
+
 PDFObjectReference PDFDocumentDataLoaderDecorator::readReferenceFromDictionary(const PDFDictionary* dictionary, const char* key) const
 {
     const PDFObject& object = dictionary->get(key);
diff --git a/PdfForQtLib/sources/pdfdocument.h b/PdfForQtLib/sources/pdfdocument.h
index e087352..94d42d4 100644
--- a/PdfForQtLib/sources/pdfdocument.h
+++ b/PdfForQtLib/sources/pdfdocument.h
@@ -307,6 +307,10 @@ public:
     /// \param object Object containing array of numbers
     std::vector<PDFInteger> readIntegerArray(const PDFObject& object) const;
 
+    /// Reads reference. If error occurs, then invalid reference is returned.
+    /// \param object Object containing reference
+    PDFObjectReference readReference(const PDFObject& object) const;
+
     /// Reads reference from dictionary. If error occurs, then invalid reference is returned.
     /// \param dictionary Dictionary containing desired data
     /// \param key Entry key
diff --git a/PdfForQtLib/sources/pdffile.cpp b/PdfForQtLib/sources/pdffile.cpp
index dd496df..ab991b2 100644
--- a/PdfForQtLib/sources/pdffile.cpp
+++ b/PdfForQtLib/sources/pdffile.cpp
@@ -107,6 +107,12 @@ const PDFEmbeddedFile* PDFFileSpecification::getPlatformFile() const
 PDFFileSpecification PDFFileSpecification::parse(const PDFObjectStorage* storage, PDFObject object)
 {
     PDFFileSpecification result;
+
+    if (object.isReference())
+    {
+        result.m_selfReference = object.getReference();
+    }
+
     object = storage->getObject(object);
 
     if (object.isString())
@@ -117,7 +123,6 @@ PDFFileSpecification PDFFileSpecification::parse(const PDFObjectStorage* storage
     {
         PDFDocumentDataLoaderDecorator loader(storage);
         const PDFDictionary* dictionary = object.getDictionary();
-        PDFObject collectionObject = dictionary->get("Cl");
 
         result.m_fileSystem = loader.readNameFromDictionary(dictionary, "FS");
         result.m_F = loader.readStringFromDictionary(dictionary, "F");
@@ -128,15 +133,53 @@ PDFFileSpecification PDFFileSpecification::parse(const PDFObjectStorage* storage
         result.m_id = PDFFileIdentifier::parse(storage, dictionary->get("ID"));
         result.m_volatile = loader.readBooleanFromDictionary(dictionary, "V", false);
         result.m_description = loader.readTextStringFromDictionary(dictionary, "Desc", QString());
-        result.m_collection = collectionObject.isReference() ? collectionObject.getReference() : PDFObjectReference();
+        result.m_collection = loader.readReferenceFromDictionary(dictionary, "CI");
+        result.m_thumbnailReference = loader.readReferenceFromDictionary(dictionary, "Thumb");
+        result.m_encryptedPayload = dictionary->get("EP");
+
+        constexpr const std::array relationships = {
+            std::pair<const char*, AssociatedFileRelationship>{ "Unspecified", AssociatedFileRelationship::Unspecified },
+            std::pair<const char*, AssociatedFileRelationship>{ "Source", AssociatedFileRelationship::Source },
+            std::pair<const char*, AssociatedFileRelationship>{ "Data", AssociatedFileRelationship::Data },
+            std::pair<const char*, AssociatedFileRelationship>{ "Alternative", AssociatedFileRelationship::Alternative },
+            std::pair<const char*, AssociatedFileRelationship>{ "Supplement", AssociatedFileRelationship::Supplement },
+            std::pair<const char*, AssociatedFileRelationship>{ "EncryptedPayload", AssociatedFileRelationship::EncryptedPayload },
+            std::pair<const char*, AssociatedFileRelationship>{ "FormData", AssociatedFileRelationship::FormData },
+            std::pair<const char*, AssociatedFileRelationship>{ "Schema", AssociatedFileRelationship::Schema },
+        };
+
+        result.m_associatedFileRelationship = loader.readEnumByName(dictionary->get("AFRelationship"), relationships.begin(), relationships.end(), AssociatedFileRelationship::Unspecified);
 
         PDFObject embeddedFiles = storage->getObject(dictionary->get("EF"));
+        PDFObject relatedFiles = storage->getObject(dictionary->get("RF"));
         if (embeddedFiles.isDictionary())
         {
             const PDFDictionary* embeddedFilesDictionary = embeddedFiles.getDictionary();
+            const PDFDictionary* relatedFilesDictionary = relatedFiles.isDictionary() ? relatedFiles.getDictionary() : nullptr;
             for (size_t i = 0; i < embeddedFilesDictionary->getCount(); ++i)
             {
-                result.m_embeddedFiles[embeddedFilesDictionary->getKey(i).getString()] = PDFEmbeddedFile::parse(storage, embeddedFilesDictionary->getValue(i));
+                QByteArray key = embeddedFilesDictionary->getKey(i).getString();
+                result.m_embeddedFiles[key] = PDFEmbeddedFile::parse(storage, embeddedFilesDictionary->getValue(i));
+
+                if (relatedFilesDictionary)
+                {
+                    PDFObject relatedFileArrayObject = storage->getObject(relatedFilesDictionary->get(key));
+                    if (relatedFileArrayObject.isArray())
+                    {
+                        const PDFArray* relatedFileArray = relatedFileArrayObject.getArray();
+                        const size_t relatedFilesCount = relatedFileArray->getCount() / 2;
+
+                        RelatedFiles& relatedFiles = result.m_relatedFiles[key];
+                        relatedFiles.reserve(relatedFilesCount);
+                        for (size_t i = 0; i < relatedFilesCount; ++i)
+                        {
+                            RelatedFile relatedFile;
+                            relatedFile.name = loader.readString(relatedFileArray->getItem(2 * i));
+                            relatedFile.fileReference = loader.readReference(relatedFileArray->getItem(2 * i + 1));
+                            relatedFiles.emplace_back(qMove(relatedFile));
+                        }
+                    }
+                }
             }
         }
     }
diff --git a/PdfForQtLib/sources/pdffile.h b/PdfForQtLib/sources/pdffile.h
index 47c19c5..32dc918 100644
--- a/PdfForQtLib/sources/pdffile.h
+++ b/PdfForQtLib/sources/pdffile.h
@@ -75,6 +75,26 @@ class PDFFORQTLIBSHARED_EXPORT PDFFileSpecification
 public:
     explicit PDFFileSpecification() = default;
 
+    struct RelatedFile
+    {
+        QByteArray name;
+        PDFObjectReference fileReference;
+    };
+
+    using RelatedFiles = std::vector<RelatedFile>;
+
+    enum class AssociatedFileRelationship
+    {
+        Unspecified,
+        Source,
+        Data,
+        Alternative,
+        Supplement,
+        EncryptedPayload,
+        FormData,
+        Schema
+    };
+
     /// Returns platform file name as string. It looks into the UF, F,
     /// and platform names and selects the appropriate one. If error
     /// occurs. then empty string is returned.
@@ -92,8 +112,13 @@ public:
     const PDFFileIdentifier& getFileIdentifier() const { return m_id; }
     bool isVolatile() const { return m_volatile; }
     const QString& getDescription() const { return m_description; }
+    PDFObjectReference getSelfReference() const { return m_selfReference; }
     PDFObjectReference getCollection() const { return m_collection; }
+    PDFObjectReference getThumbnail() const { return m_thumbnailReference; }
     const std::map<QByteArray, PDFEmbeddedFile>& getEmbeddedFiles() const { return m_embeddedFiles; }
+    const std::map<QByteArray, RelatedFiles>& getRelatedFiles() const { return m_relatedFiles; }
+    const PDFObject& getEncryptedPayloadDictionary() const { return m_encryptedPayload; }
+    AssociatedFileRelationship getAssociatedFileRelationship() const { return m_associatedFileRelationship; }
 
     static PDFFileSpecification parse(const PDFObjectStorage* storage, PDFObject object);
 
@@ -122,11 +147,25 @@ private:
     /// Description of the file (for example, if file is embedded file stream)
     QString m_description;
 
+    /// Self reference
+    PDFObjectReference m_selfReference;
+
     /// Collection item dictionary reference
     PDFObjectReference m_collection;
 
+    /// Thumbnail reference
+    PDFObjectReference m_thumbnailReference;
+
     /// Embedded files
     std::map<QByteArray, PDFEmbeddedFile> m_embeddedFiles;
+
+    /// Related files for embedded files
+    std::map<QByteArray, RelatedFiles> m_relatedFiles;
+
+    /// Encrypted payload dictionary (used in document wrapper)
+    PDFObject m_encryptedPayload;
+
+    AssociatedFileRelationship m_associatedFileRelationship = AssociatedFileRelationship::Unspecified;
 };
 
 }   // namespace pdf