People here are using this to question Wikileaks integrity but it seems like a minor mistake given the contents of the dump. This has happened before in hacker dumps on a number of occasions but this one isn't even malicious (targeting wikileaks users).
I don't open random zips from spam emails on my machine and I wouldn't from random wikileaks emails without checking them for viruses like the author of this post did.
There is even an argument for Wikileaks to keep the malwared content for research purposes. Maybe just include a warning for those who aren't technically inclined enough to know to not open them in a clean VM.