Praetorian Prefect Adobe to release critical update on patch Tuesday
A humorous discussion of the issues can be found here on this NZ technician's blog, but seriously, practical Application Security starts with matching the product to the requirements. If you are just adding features for fun (or in Adobe's case, almost certainly to use the freeware to cross-sell other apps - they now sell Shockwave and Macromedia's old product lines) then you're failing your customers. Given Adobe's market penetration, their product's subsequent contribution to the global virus load makes this unforgivable.
Practically Secure recommends SumatraPDF - a 1.2MB downloadable PDF reader that just, er, reads PDFs.