Why has ClamAV just been installed on my 12.10 system?

[Chris Green]

For some reason ClamAV has recently been installed on my 12.10 system, I
guess it must be because of something I've installed recently but I
can't think what really.

Does anyone have any idea what might install ClamAV as a dependency? 

I don't think I need it really as it scans mail for malware and I can't
really see what would even be able to use it on my system.

-- 
Chris Green