Does pdfinfo give any indication of the application used to create the document?

Oracle Documaker PDF Driver PDF version: 1.3

If it chokes on the Java bit up front, can you extract just the PDF from the file and look at that?

Not sure how to do that but I did just try pdfimages -all which was not useful since it’s a vector PDF. pdfdetach -list shows 0 attachments. It just occurred to me that pdftocairo could be useful as far as one way to neuter the doc and make it useable, but that’s a kind of a lossy meat-grinder option that doesn’t help with analysis.

You might also dig through the PDF a bit using Dider Stevens 's Tools,

Thanks for the tip. I might have to look into that. No readme… I guess this is a /use the source, Luke/ scenario.

I appreciate all the tips. I might be tempted to dig into some of those options.