Jotti and Virus Total have some of the same AVs, but Virus Total has about twice as many AVs as Jotti. I prefer to scan with Virus Total. It looks to me like you do not have enough AV detection on your file to make a good decision as to whether it is a virus or false positive.
Here's what I recommend. I have 5 "trigger" AVs that I use to help me make a decision: Avira AntiVir, Bitdefender, Nod32, Kaspersky, and Sophos. I need to see at least 2 of these AVs verify an infection before I believe it. You have to be careful, however, because when a virus is new, not many AVs will see it for a few days. Virus Total has an advanced configuration tab that you can use to get more detailed information about a file. After uploading a file, choose that tab and go down the page to find out when Virus Total first saw the file. If it is more than three days old, my "trigger" AVs should detect it by then if it is a virus. If it is less than three days old, and at least 2 triggers do not yet detect it, you can not make a good decision until day three.
If a file turns out to be a false positive detection, upload it to Clam AV so they can correct the signature, starting at http://www.clamav.net/lang/en/sendvirus/
on the web. Clam AV furnishes the detection engine and virus signatures for ClamWin.