Here is an informative link:
http://help.adobe.com/en_US/Acrobat/...ff-7eeb.w.html
I am not familiar with the MAC operating system or if the operating system has anything to do with the conversion. Another point is I don't know what version (if any) of Adobe Acrobat you have (Standard or Professional) but, I am almost certain that you cannot export from an Adobe Reader. The best you can probably do there is to cut & paste...then reformat (you may have to do that as well from the Standard or Professional versions).
Don't know if this helps you or not...hope so.