I found some strange modules on npm. They look very suspicious.
I tried to understand the code, but it's really hard.
https://github.com/kaizhu256
https://www.npmjs.com/package/utility2
If you check the utility2 on npm, you'll see the guy has also registered an account with the name npmdoc.
/cc @derhuerst @ChALkeR @sindresorhus