A free malware analysis service offered by The Shadowserver Foundation allows you to analyze suspicious files and extract information on their process and network behavior while being executed. Malwr.com is built on top of an open source malware analysis system called Cuckoo Sandbox, which is developed and maintained by the same people.
The benefits of Malwr.com are:
* It's free.
* It's independent from any security vendor.
* It's not commercial, it exclusively lives off of its developers, donators and sponsors.
* It can run multiple, distributed and crowd-volunteered machines to perform its analysis.
In order to use Malwr.com you just need to choose the file to analyze, solve the captcha and submit it.
Try it here - http://malwr.com/submit/