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What is packaged PDF and how can I read it?

I was sent versions of the "packed PDF" files, where the top-level PDF contains child PDF files.

Top-level PDF acts primarily as a container. Packaging is not always obvious in Adobe Reader (for example, when pdftk is used to package a link, it is not displayed). I cannot find enough for Googling for this term, nor in my 2012 book ("Whittington", "PDF Explained", O'Reilly).

Is this a standard part of the PDF? If so, I would be grateful for the pointers. And can a PDFBox parse it?

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As for your question, is using PDF as a container file format a standard part of PDF:

Yes it is. ISO 32000-1: 2008 describes it in section 7.11.4 Embedded file streams.

The most noticeable are the files associated with any page of the document, see 12.5.6.15, Annotations for adding files and those associated with the document as a whole through the EmbeddedFiles (PDF 1.4) entry in the PDF document dictionary (see 7.7.4, Dictionary of names).

@ Jesse A useful link to the PDF file specification on the PDFBox website explains how to deal with the latter.

PDFBox , . , , , , PDF.

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