Same thing happened to me last night on my Verizon 2014 Moto X with Lollipop. Never saw it before. Not sure which app downloaded it.
I can't quite figure out what the script is supposed to do, but the code seems to be too nicely commented to be malware. Though I suppose malware authors can be disciplined coders too
UPDATE: Also happens when clicking on a CNN tweet to open a CNN news story. Tries to download from z.cdn.turner.com when using FIreFox on Windows 7.
www.forbes.com