Branden put it well. While there is some possibility of this being used to trick some clueless user into executing some commands they otherwise wouldn't have executed, said user would need to be clueless enough to copy-paste commands they don't understand into the shell prompt, in which case you could just get them to execute the commands directly instead of going through a DESC file.
Maybe this report is useful if you want to play a practical joke on your friends (who do trust you enough to blindly compile a groff document you send them with a custom DESC file) -- I'll be using this information that way.
