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Yes, a plug-in can do that, but you may have a hard time finding a plug-in that already implements this feature. My first candidate would be Enfocus PitStop Pro - they may have features that allow you to create a profile that will only find black boxes. They have an evaluation version, but PitStop has a steep learning curve: PitStop Pro Software - Detect & Correct Errors in PDFs
If this does not work out, you may have to look into a custom plug-in. If that's the route you want to go, feel free to get in touch with me (my contact information is on my profile page).
Thank you so much for this information, I am reviewing the documentation for PitStop right now, I will post an update within the next day, fingers crossed!!