Today I got a piece of spam sent to the email address that was only used for communication with allofmp3.com. In case you have forgotten, that was a shady music seller who sold MP3 music files by the megabyte, but was eventually shut down through pressure by the US trade representative. The spam had a PDF file attachment, which means that either they use PDF to evade filters or else the PDF is a potential virus.
Anyone out there interested in dissecting a potentially rogue PDF file?