Text outside of the crop box can be removed using Tools Sidebar->Protection->Remove Hidden Information (though this will not remove overlayed images if any such are present). When the Remove Hidden Information tab is done analyzing, uncheck all selections except for "Hidden text" and "Deleted or cropped content" and then click Remove. Having done this, you can select the crop tool using Tools Sidebar->Pages->Crop, double click on any page and in the Change Page Size field you can then safely set your own white margins. While I have not tried it, it seems that one can remove cropped content directly through the Change Page Size field as long as there are no issues concerning content overlap.
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