Re: How a video can be delivered through ...
They did find an encrypted payload within the file - which they could not decrypt in order to ascertain if it was malicious. What is the probability that it was not benign? The encrypted nature of the final delivery mechanism was irrelevant.
"...but it seems an encrypted blob of code in the 4MB video file was able to run spyware on the phone, presumably via a software flaw. The team was unable to decrypt the payload.