You can always open the PDF in a stand-alone PDF viewer that doesn't support javascript. Like xpdf, mupdf, or atril, or one of possibly many other PDF viewers.

You can always open the PDF in a stand-alone PDF viewer that doesn't support javascript. Like xpdf, mupdf, or atril, or one of possibly many other PDF viewers. (those are the only ones I have installed right now, I think) Or there's poppler-utils which contains a bunch of tools for dealing with PDF files. You might be able to write a script which uses them to extract the contents into a safe format (maybe even a different PDF file?).