It seems the site is hacked again. Jotti scan of that new jar: http://virusscan.jotti.org/fi/scanresult/26db3657d16353aceac4de3c774438bbbcf97627 that is available to download currently.
About that backdoor.comet.939: http://vms.drweb.com/virus/?i=3623464.
It seems inside of that jar is a exe...
How Much GP Are You Selling?: 125m
Skype?: risjarv.sythe
Who's skype have you added?: elenamzsythe
Who would you like to sell the gold to?: you.
What payment method would you like?: Paypal.