This reminds me of some worm/virus/??? I'd see on people's computers back in the Kazaa days. It seemed like it would copy itself into the shared folder, picking filenames based on what was already there: e.g. Alanis Morisette - Ironic.mp3.js

I never looked at what its payload was. It's good to see that js viruses have also made their way to modern coding standards.