I have seen this asked here and there, but I just can't find an answer on it, does ClamAV scan for Linux viruses as well as Windows ones? Or does it at least have heuristics capabilities which would allow it to potentially detect Linux malware? I understand from this that it is best for detecting Windows malware, but can it also detect Linux malware?
ClamAV does detect viruses for all platforms. It does scan for Linux viruses as well. However, there are so few viruses ever written for Linux that a Linux virus is not a huge threat.
Unix-like systems (which eventually led to Linux) has been around for roughly 30 years, and Windows has been around for about 20 years. In those 30 years, only 40 viruses have been written for Linux, whereas more than 60,000 viruses have been written for Windows.
Here is an interesing article on all Linux malware (notice how it fits on one page ^_^):
Hope this helps. If you want more information, wikipedia has a page titled "Linux Malware".