What was the infected file name, where was it found e.g. (C:\windows\system32\infected-file-name.xxx) ?
Well to start with -gen signatures are generic, designed to detect a family rather than an individual virus/trojan. There are also many different names as there is no standardisation for malware naming, see this translated page
Ardamax-gen this gives a number of aliases which you can also search for.
Secondly a google search for Ardamax-gen returns many hits and this is how we find the information to answer your questions, hint

One is in the avast forum and it seems you missed a bit of the malware name, Win32:Ardamax-gen [Tool], the important bit being [tool] as this could also be a keylogger tool.
Ardamax is a commercial keylogger. One of the features described on their web site might apply to you (assuming you didn't install this):
"Engine Builder - creates a customized Ardamax Keylogger engine file. You can email this file to your target for remote monitoring. "
The web site is here
http://www.ardamax.com/keylogger.html
Does this ring any bells ?
Lastly I have never bothered to go looking for myself for what a virus or trojan does so long it is detected and dealt with. If I experience any issues with it then I find out more about it to be able to fully deal with it, that usually entails searches on the file name, virus name and any aliases to gather the information. This can be a long process so I don't do it very often, I also rarely have any viruses/malware to detect.