I could be wrong about this, but I thought Adobe .pdf files can only be modified using the PRO version. Very spendy unless you can, um, 'appropriate' it for youself.
One of my co-workers did just this 2 years ago. We had quite a bit of sport altering official corporate manuals and releasing them to the crew.
That is part of the allure. You can publish documents that can't easily be altered, only 'read' (hence the name, Adobe Reader).
Trying to copy/paste into another program might be your only other option. I don't believe I've ever tried this though. Maybe someone else can chime in?
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'06 DC SB Sport, V6, AT, 4X4, MB Gunner 6's, Bridgestone AT, 285/75/16, 884s w/top plate spacer & 1.5" blocks in rear. TSB rear springs...
R. I. P. 
"The older I get, the better I was."