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Fix high ink coverage in Acrobat?

I'm putting together a little event programme and some ads have been supplied as PDF with >300% ink coverage in some areas. The high ink areas were highlighted with InDesign's separation preview.

I can fix this in Photoshop, but I want to reduce the amount of tinkering with the original files - is there a way to reduce high ink coverage areas in Acrobat?

Running CS5.5 on OSX10.6.