Looks like hex obfuscation of malicious code.
I could be wrong though, it could just be a warning.
Can you recognize malicious code from hex?

I know these messages include a signature, so we can verify that this message indeed came from the authors. So it would make sense if the extra data is a signature (which will not be ASCII).
I can only recognize that its obfuscation and not a normal print out of something.
[Edit]: Alternatively, maybe there is an exploit that allowed a popup ( which would explain "ALERT:" ), thus the reason for the obfuscation. Again, I haven't deciphered the code...so, I could just be blowing theories out the window.