Pastika is a polymorphic file virus. While spreading, it infects the system with the Jindra boot virus.
Pastika activates on 21st and 22nd of every month. At this time it overwrites the beginning of the hard drive. While overwriting, it constantly displays this line:
Jindra & Pastika je zde!!!
This is Czech and means "Jindra and Pastika are here".
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.