How " good " are these anti malware programs ?

After reading various threads i decided to try some apps.
I got a crack from usenet and scanned it with :Malwarebytes' Anti-Malware ,SuperAntispyware, Trojanremover and Spybot ;
none off these apps found anything suspicious.
I then uploaded this file to " virustotal" here is the result :
~Virus Total link removed per Policy. - Ron~
And to :http://www.threatexpert.com/report.aspx?md5=9c6aed9f1b4ec0947069ad4f70bc13a6
Any thoughts on this ?
Lin
EDIT : i presume Threatfire is from the same company as the above link since thera is a link on that page to Threatfire , i dl this app , and a scan found nothing suspicious.............
My resident Av ,Nod 32 2.7 ,it found the malware,

 

So you found something they don't currently detect? No application can detect 100% of malware out there.

Be a good sport and go submit the samples

 

I don't mind submitting the files ,but 6 renowned apps missing this ,makes me think .
I just dl another crack ,only Nod found it " Futuremark PCMark05 Advanced v1.0.1(Working Keygen).exe - probably a variant of Win32/Injector.DW trojan "
and Threatexpert :http://www.threatexpert.com/report.aspx?md5=81eaa0640891b5e31260e098cbfa2397

 

How do you know they are malwares? Many companies flag innocent keygens and cracks.

 

I guess it depends on your definition of "innocent".

If all the keygen does is create a key\write it to your system for a particular program then I guess it could be said to be innocent. Still illegal though.
So, should it be flagged?
What parameters do anti-malware programs use to decide?
Is it there job to only protect your system or others software products as well?

Very close to going off topic here so I will take my leave.

 

If you have a look at the link i gave you see that the scan reveals a trojan ; " Trojan.Vundo consists of the following components:
* HTML code that exploits the Microsoft Internet Explorer Malformed IFRAME Remote Buffer Overflow Vulnerability (BID 11515)
* A downloader component
* Adware
* A DLL module that is installed by the adware "
I realize many cracks etc get flagged because of heuristics , it would then be a false positive indeed if all it does is alter the exe of the intended target.