Symantec found a vulnerability in Adobe Flash there are two simple ways to protect yourself against this and other security nightmares a) update your software frequently b) be VERY careful when opening attachments, even ones from your mother.
Symantec writes, in their blog:
For the exploit to successfully work, the malicious attachments need to be opened on a computer with a vulnerable version of Adobe Flash Player. The malicious documents contain an embedded reference to a malicious Flash file hosted on a remote server. When the Flash file is acquired and opened, it sprays the heap with shellcode and triggers the CVE-2012-0779 exploit. Once the shellcode gains control, it looks for the payload in the original document, decrypts it, drops it to disk, and executes it. Symantec detects this payload as Trojan.Pasam.
Be careful when opening files through email.
Be careful when visiting web sites.
Be careful when using WiFi networks.