Seen firsthand
It is an advert for regular backups of data. Doesn't affect network drives, well it didn't on the laptop I have here.
I think the infection came from updatessoftms.ru so if you have a corp. firewall block it, although being rogues I doubt it will be limited to the one site. It was that site forward slash random 15 chars.pdf
There are ways to plug adobe vulnerabilites. http://ctaspley.wordpress.com/2010/08/24/protect-your-pc-against-adobe-pdf-reader-security-flaws/
When it launched the PDF if ran some java which was picked up by trend but didn't stop his infection.
Biting the hand that feeds IT
