For those not familiar with it, the EICAR Test File is a text file commonly used for verifying Antivirus software is properly working. More info can be found on EICAR.org
I stumbled upon an interesting bugtraq post from 2003 which I felt was worth sharing. The post disassembles the EICAR test file and looks at how it works.
Interesting read, especially if you're interested in programming.