Think about it for a minute.. If there actually were such a library, it would be closed down in a flash because of the security ramifications of leaving it open.. In addition, most such malware are directed to scamming users across the world.. Most such things are illegal in most, if not all countries.
And most importantly, this is a security forum you've posed the question in.. Why would security folks post a list of viruses/malware for the entire world to download and distribute.. hmmmmmm
Hope this helps.
I've got a clean WinXP machine, and I'm looking to infect it with a reasonably representative range of threats to test my security workup- a random smattering of spyware, a simple virus or two, a virulent virus or two, and perhaps a rootkit of some sort. I'm looking for things that are difficult to remove- it's OK if they're damaging, since this will be a system with no value to me beyond this test.
Is there a recognized library of sample threats out there, or will I have to spend an hour or two browsing Russian midget porn and listening to Sony BMG CDs?