Trojan horse whith Java download

[iurlarofashion]

C:\Documents and Settings\Maxim\Dati 
applicazioni\Sun\Java\Deployment\cache\6.0\7\5bc23b47-569827b8 = ZIP = 
hfdymuqcqdjsepayw/anmdrybvyqjttr.class - Java/Exploit.Agent.NCT trojan horse
Eset nod 32 has found this file.
Why?
Massimo Passalacqua