Looks to me like he is just messing with his status. I expect it is just a trick with the fonts.
(Your BBM screen did have me confused for a while, then I remembered you type from right to left)
If you are worried, then go to the app store and update bbm. But, AFAIK, there is no "hack" he can do to access your phone.
Edit: Looking closer and comparing to my bbm screen...
All your friend has done is to create a two line status message for himself. I expect he has managed to past in a newline character.