Adding white space to PDF after cropping

I have a PDF that I would like to crop to text and then add consistent white space (margin). The PDF was generated by a Bookeye 4 scanner. Which exported the content straight to PDF. So, I am trying to do this with Adobe Acrobat 9.2. SIL Americas Area Publishing suggested that I use ScanTailor - An excellent program, but one which I find crashes on OS X.

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