While it works on Chromium it does not seem to work in xpdf, pdf.js nor any other pdf viewer that I tried. It seems that JS, flash, etc inside pdfs are proprietary, useless, and potentially dangerous adobe-only extensions that nobody else implements and nobody uses. It's just that Chromium happened to have a JS engine so they decided to let JS inside pdfs to be executed with a very constrained API (which can't do anything malicious probably - unless a bug is found in its JS engine).

My point still stands: I do not expect a pdf document to be able to do anything like the djsumdog's link and neither do most people. If a pdf document was able to do anything like that I would consider that viewer as broken.

> The average JavaScript developer doesn't know how to extract JavaScript from a PDF.

They could learn with a few google searches.