One of the perks of working at LEGO Brand Stores is that if you’re in a management position, you sometimes get to conferences and you also get to bring some memorabilia back home with you. That’s what happened with someone’s friend in the AFOLs of Facebook page.
The OP’s friend was given the above packaged zombie minifigure by their manager who attended the 2015 LEGO Brand Retail Manager’s Conference. It appears that all the pieces of the zombie are official pieces minus the tattered yellow LEGO apron. I’ve seen some pretty cool stuff posted from these conferences but this zombie LEGO employee is probably the coolest one I’ve seen so far.