PDF Files

How are PDF documents sanitized?

PDF is an open format, with a dedicated documentation - and not a short one. In a sense, PDF looks like HTML: powerful markup language than can embed scripts, with a vendor-dependant support of features.

The only way for us to clean up a PDF document is to loop over the elements and remove what we know to be JavaScript (or, more precisely, Additional Actions).

This might break Acro Forms, if any.