How could I receive a text the sender didn't send?

A

AC Question

Last night my brother and I were texting. In between texts, I started receiving other texts from his phone, definitely not from him, and not auto response. This is what it said: "Bae you gone be ok i love you" followed by T�_�P�A�P�IØ=ܦØ=ܦØ=ܦ

We both have android phones. I have no idea what this means, and he was as shocked as I was when I copied and pasted the msg back to him. Has anyone ever had this happen or know what the code at the end means?