Trojan-Downloader:W32/Agent is a very large family of programs, most of which download and install adware or malware to the victim's machine.
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 False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Trojan-Downloader: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:
A detection with the name, " BehavesLike:Win32.Malware" is a Heuristic Detection. It indicates that a file was identified as a possible threat due to its suspicious behavior. This detection is commonly triggered by malware that attempts function as, or to impersonate, legitimate applications.