Same here.

I believe PDF spam can be used to circumvent most conventional spam filters, which is the main reason they're doing it. Also, I believe there was an exploit a while back that made it possible to execute malicious code through Acrobat documents and older versions of IE/Firefox. Sometimes I wonder how these kids manage to find the exploits ... if they spent their time doing something at school instead, the world would be a much better place.

Same for spammers, of course. No one reads spam, and I'd be surprised if they ever even got one sale out of their product adverts. SO WHY DO IT?