I have this bizzaro issue happening in my RDSH 2008 R2 farm since the Holidays.
When someone prints certain PDF's from IE 9 (doesn't seem to happen in Google Chrome). The print server that's also Windows Server 2008 R2 box gets the PDF's with funky characters added to the extension...like a box, a zero, random other stuff.
Windows 7 32 bit PC's that we have don't seem to get these things