It seems like there is a constant flow of PDF vulnerabilities. Two new ones are highlighted here.
It's time to stop using PC-based PDF readers.I've switched to a browser plug-in called gPDF which works with IE, Firefox, and Chrome.It opens the PDF file in Google Docs. Google Docs gives you the ability to print it without downloading it. The one issue I have is, there is no apparent way to save the document in Google Docs for future reference. So for that, I save the link in Delicious.
I'm done with downloading PDF's for now – just not worth the risk.