[barnabees]

There could be something shady going on but I've seen this message occasionally with my OEM cable. Realistically, what could a secret device in your cable do?

[ridgered4]

Couldn't it be a keyboard that delivered a set of keystrokes to retrieve malware by opening a web browser or some other common program?

[derkades]

Act as a keyboard ("rubber ducky"), retrieve pictures if allowed, exploit some zero day, ...