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Document Geek
Community Expert
Community Expert
April 14, 2016

Check the Document Propertied panel and see if there are any actual fonts used. If not, you can try using custom stamps with a blending mode. Read this article that I wrote on the topic: Document Geek: Highlighting a PDF that contains no fonts

Or you can use the drawing markup tools and just reduce the opacity, but that obscures the text a bit.