If you scan any document directly into Acrobat Pro it OCRs the text and form elements and creates many pieces with clipping paths. There are pieces of text the OCR didn't pick up on and the rest of the text has been exported as a bitmap as per the output settings the user had selected when the document was created. Try scanning any document yourself directly into Acrobat Pro and then open it in Illustrator and you will arrive at similar results.
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