There are a very large number of variants in the Worm:W32/Agent family, most of which may download and install malware onto the machine as well as propagating to any available host connected to the infected computer by a network.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A representative example of a Worm:W32/Agent variant is:
Worm:W32/Agent is a subset of the "Agent" family, which groups together a wide variety of malware that do not fit into any other known families. The Agent family includes trojans, worms, viruses, backdoors and other types of malicious programs.
For representative examples of these other subsets, you can also see:
Date Created: 2006-01-01 09:06:22.0
Date Last Modified: 2010-07-12 08:28:08.0