According to the virustotal webpage for Torntv Downloader.exe, ClamAV antivirus with its antivirus definitions updated to July 6, 2013 or later will detect the Torntv Downloader.exe malware.

ClamTk is a graphic front-end for ClamAV antivirus. In order to install ClamAV, open the Ubuntu Software Center and search for ClamTk or run the following command from the terminal:

 sudo apt-get install clamtk

The Ubuntu Documentation ClamAV wiki contains information about how to use ClamAV. By default the ClamTk GUI front-end displays the names of all infected files, but does not delete them, so you have to delete them manually. If you want to scan for infected files and also delete them automatically, you can do this by running clamav from the terminal according to the instructions in the Ubuntu Documentation ClamAV wiki in the sections of the wiki titled Scan Files and Remove Infected Files.