Can't find file for Trojan Horse on my MacBook

Question

Anyone seen this before?
I have the Norton Antivirus Program installed on my MacBook.
I believe an attack occurred while I was looking through the Apple Support Forums for help with a QuickTime problem and accidentally clicked on the following link: http:www.smacktalkpaintball.com/video/
The Norton Warning came up and I hit the delete option and then set Norton to scan manually.
The following came up at the end of the scan:
Virus "bof.jar-51a4bd07-3d4b399d.zip" detected, Today at 7:24 AM. Repair failed.
/Users/Owner/Li...bd07-3d4b399d.zip Trojan Horse infected
I was not able to locate either of these files anywhere on my computer.
I have two external hard drives that I use to back-up data, but neither of them were connected at the time of the attack, and nothing else was connected when I ran the virus scan.
I do not have Windows installed on this MacBook - Mac OS X, Version 10.5.8,

Answer 1

Norton was able to detect the Trojan whereas MacScan was not, but Norton was not able to remove it
That sounds an unlikely outcome on both counts. Norton anti-virus is just that: anti-virus, and I would not trust it to deal with trojans.
Are you sure you actually installed a Trojan?
If you allow a Trojan to be installed, the user's DNS records can be modified, redirecting incoming internet traffic through the attacker's servers, where it can be hijacked and injected with malicious websites and pornographic advertisements. The trojan also installs a watchdog process that ensures the victim's (that's you!) DNS records stay modified on a minute-by-minute basis.
You can read more about how, for example, the OSX/DNSChanger Trojan works here:
http://www.f-secure.com/v-descs/trojanosxdnschanger.shtml
SecureMac has introduced a free Trojan Detection Tool for Mac OS X. It's available here:
http://macscan.securemac.com/
The DNSChanger Removal Tool detects and removes spyware targeting Mac OS X and allows users to check to see if the trojan has been installed on their computer; if it has, the software helps to identify and remove the offending file. After a system reboot, the users' DNS records will be repaired.
(Note that a 30 day trial version of MacScan can be downloaded free of charge from:
http://macscan.securemac.com/buy/
and this can perform a complete scan of your entire hard disk. After 30 days free trial the cost is $29.99. The full version permits you to scan selected files and folders only, as well as the entire hard disk. It will detect (and delete if you ask it to) all 'tracker cookies' that switch you to web sites you did not want to go to.)