Trojan-Downloader:W32/Agent.MRL may be dropped onto the system as part of the payload of another malware, such as Exploit:W32/AdobeReader.UZ.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More scanning & removal options
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.
On execution, Agent.MRL will attempt to download a file from a remote site. If successful, the downloaded file will be executed on the infected machine.