Assuming AGI existed, detected it, and understood the signal’s message — things might get interesting depending on what the message said and how the AGI responded.
But 'Interesting. Please continue?'
Near the end of the movie Contact, where two higher ranking TLA-agents discuss the lack of evidence for the things the protagonist told, which allegedly happened to her, but weren't captured on anything.
Out of my head...One: 'Bla bla bla.' The other: 'Bla bla just static.' One: 'Yes, exactly 18 hours of static.' The other: 'Continue...' Or something like ironically: 'Interesting. Please continue?'
Here is the scene: https://www.youtube.com/watch?v=yeUuFHGj6TM.
You need Rust in there somewhere.
Now imagine an AGI actually understanding the message when it gets developed some time later, and, well, doing the required something which the message apparently explains how to do.