Crimeware packs are the "Threat of the Month"
Threat of the month: pdf.exe.zip files
Crimeware packs, also known as mass malware packs, are software toolkits that are designed to exploit vulnerabilities in order to steal information from unsuspecting victims who are usually infected via drive-by downloads.
How does it work?
Crimeware packs are installed or embedded in compromised websites. The software usually contains several exploits, varying from old to new.
Should I be worried?
Crimeware packs are widely available and some of the more popular ones can be obtained for free. There is no shortage of web application vulnerabilities on the internet.
How can I prevent it?
Everyone should keep their software up to date and actively monitor patches with vulnerability scanning. Although anti-virus solutions won't detect zero-day malware, they do work well for identifying known exploits that are contained in crimeware packs.