Monday, April 22, 2013

Update to Jsunpack PDF parsing

Hey guys, I just added a patch from David Dorsey of Visiblerisk, Inc. (Thanks David, you are a boss!).

Below is a sample PDF you can test with just to see how awesome it is:

David described a lot of the improvements and the analysis he performed at the following blog posts entitled "Analyzing Malicious PDFs or: How I Learned to Stop Worrying and Love Adobe Reader"
Part 1:
Part 2:

In brief, this update improves's XFA parsing, PDF encryption tags, and generally the update will help you to decode some malicious PDFs where had trouble decoding them before.

Thanks to David and please if you see any bugs related to this update please report them at and I'll fix them.