Probably the best thing is try out a free trial of various pdf extract packages but you will probably have to end up paying.
Able to extract professional includes OCR (but I'm not certain if the free trial includes this). It works quite well.
Adobe
Nuance pdf reader all have free trial periods.
Be warned though OCR is only as good as the original scan (I've tried extracting old timetables and its not 100% acuurate.
Good luck!