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Whats the issue with it, I cant tell if it's the camera or if some of the pads are just a little bit dark? If it works clean it up with a bit of ipa and be done with it, it's not a new cpu so if it works then happy days. I hope you didn't pay a lot I sold a few of these CPU's a while ago for £35/£40.
it just thermal paste nothing to cry about. just wipe it off and move on with your life
my tears cleaned it right up good as new
Your photo isn't the best, but are we looking at the small light grey bits mid left ,o r the whole of the darker area bottom left? Or is the darker area just the way the pic has been taken?