Malicious Trial Account?

Randomly this morning, a trial account for the Classic World of Warcraft was added to my account without my prior knowledge. Ive been playing since the day World of Warcraft first came out and the only time Ive been hacked was by a malicious addon website.

The problem with this trial account is simply I had no prior knowledge to ever adding a trial account, it just randomly appeared. I discovered it when I logged on to learn I had to select an account, my own or the "WOW1" the trial account that I learned about today.

I think this trial account is potentially malicious in nature, I dont wish to contact Billing and Account services until I get some FeedBack onto the nature of this random trial account. I havent been on guildlaunch or any websites of such nature where I require to submit my email and I download my addons from Curse.com, which I deem as a safe website to download addons from (provided the addons arent downloading a .exe file or anything, its a fairly "protected" website).

Any ideas community? Call Blizzard to delete that trial account or not. I ran a quick scan and the results were nothing harmful on this computer. Figure Im in trouble or not?