I am having the same issue. Several people have posted about this same problem on the Minecraft.net forums. I tried contacting McAfee technical support, but they were about as helpful as asking my dog to defrag my computer... Except my dog is less rude. I definatly will not renew my subscription to McAfee.
This file is classed by McAfee as Artemis!13DB67307A3D
There is a request in the Artemis discussion section to have it unclassified : https://community.mcafee.com/message/227092#227092
This thread will be moved to the Artemis section and locked; a note will be added to the other thread pointing to this one.