It would appear that spammers and scammers are now starting to use PDF file attachments as a means of spreading their wares.

http://www.snpx.com/cgi-bin/news55.c...4239321?-13948

I guess this one is of more interest in the institutional security sector as many organisations use the paid for Adobe product to write and edit such documents.

Employees might thus be lulled into a false sense of security whilst home users would possibly be more suspicious of this relatively "unusual" (to them) format?