I converted a LIT book yesterday with the ConvertLIT GUI (use Google). I then ran the resulting .opf file though
MobiPocket Creator (installed as Publisher Edition) and I was good to go (no weird symbols).
You can also use MobiPocket Creator with your PDF file since it looks to be mostly text.
EDIT: Rats, I just noticed you said you were on a Mac. MobipocketCreator is a PC program only. Not sure about ConvertLIT. Sorry.