Q:
I was wondering if there is a way to detect if the pdf file contains embedded file/documents?
A:
You can use PDFNet to detect pdf files with embedded file/documents/attachments.
You may want to search for “file attachment” in this forum).
I found several of relevant articles:
https://groups.google.com/d/topic/pdfnet-sdk/CKd7KjJMvfQ/discussion
https://groups.google.com/d/topic/pdfnet-sdk/gA8o_eKVG7c/discussion
https://groups.google.com/d/msg/pdfnet-sdk/E5O9oDXDIg4/I19oYLciDeEJ