This virus may be related to the 'Klaeren' virus - at least it contains the same "bug", which prevents it from successfully infecting any file larger than around 4000 bytes. Longer infected files should be discarded, as they are probably unusable.
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 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.