Does anybody know what that hack was designed to do?

Asking because last night when ZoneAlarm kept giving me warnings saying a trojan was downloaded, I noticed the java console had also suddenly appeared in my taskbar.

Before I purchased something from the store today,  I opened ZA and saw that those viruses had been quarantined. I let ZA delete them.

Still, I don't know if I'm 'safe'? : (
I'd hate for my purchasing info to be compromised. : (