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.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
More information on 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.