Commonly used to download Kovter. Also been used to download cryptowall, teslacrypt,radamant...
They added a crappy 'ransomware' piece to the top of the javascript that will download a simple exe that takes a file as a parameter and XORs the first 0x800 or 2048 bytes of the file with a static 255 byte key.
The XOR is done by reading a single byte from the file at a time....
javascript and file crypter exe in attachment.