Idealy the response would contain a virus that would fry his device or give you remote access to it
Dont think thats possible though unless you could lour him into opening the attachment :(

A bit off topic if you haven't sorted your byteball airdrop yet send an address to eddardsteem@gmail.com I'll send you back the liquid bonus I get for reffering you as well total should be about (120$ for you) every little helps :)