CSC ("CorelScript") is a prefix indentifying Corel Script viruses. These viruses replicate within Corel Script files ("*.csc").
Corel Script is a script language that is included within several Corel's applications, including Corel Draw.
For more information, please look at the description of the first Corel Script virus, CSV.
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.