My AVG scanner recognized this immediately and asked to remove it.
http://www.eicar.org/anti_virus_test_file.htm (if you want to know more)
How to use:
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
1. Open a texteditor (notepad)
2. Copy & paste the code
3. Save as "anything.com"
EDUCATIONAL PURPOSE ONLY!
PS: I heard if you got a real hardcore scanner it could even detect the "virus" code on the webpage and warn you, if you wondering what's going on. ;)