Edgar definitely accepts PDF and has for years.
Yes, that would be dramatic and I'm sure that's how it would be portrayed in a Hollywood (Bollywood?) movie!
But as you know alarm bells would go off as the Edgar compliance departments received filing notifications via email and text messages. The security could be halted I suppose, but the IR people could instantly notify people it was a fake 8-K.
I dunno. They could easily trace the subsequent orders to at least the broker.
Seems to me a much smarter way to make money is by front running the news in small trades. Smaller reward, but far less risky. The fact that the SEC only discovered the hack afterwards leads me to believe this crew went the low risk route.