There are a lot of factors to weigh in here.. what is the country of origin for the site in question? who is behind this malware? in the world of malware there are some state sponsored and larger corporate/criminal entities often involved. The same with a lot of other criminal internet activity as I've suggested before, from my experience of being in that world... these are not people to be mucked with. For your own safety, just report the site.. http://www.google.com/safebrowsing/report_badware/
along with many other places you can report malware. If the site is a spoof or phishing attempt, or a dup of similar looking software... also report it to the company that it's mimicking, they can alert their user base and possibly take other actions.
Interesting side-note.. have you ever looked for a malware site or malware software user agreement or ToS? Laughably enough, some actually state that they are malware and that your download and usage of the malware implies your consent to using it, etc. etc..
Also, many sites that are serving malware are either hacked or will claim to have been hacked.. therefor, attacking that site may land YOU in legal hot water.. perhaps, YOU put that malware there?? The authorities may see it that way.