“Don’t open it. Or, at least DO NOT click on the link it contains.
What will this now-popular hacker email look like?
It will be an email from SOMEONE YOU KNOW that looks like this.”
Seriously, don’t click on a link in an email unless you were expecting it, and if you’re going to send someone a file or link in an email, write out a full description of what it is and why the person should open it. Because, if you don’t, I’m not opening it and neither should anyone else.