Your PDF document is simply an image that is 12,600px wide by 12,489px high. So it is likely the other PDFs you were opening were not photos. If they were, I would compare resolutions. Also, Acrobat cannot edit a photo. It tries to OCR the image but because of the really large image size and complexity, it is erroring out. I have a computer with 256GB of ram and a very high-end video card and Acrobat still chokes. It is more about Acrobat than your computer.
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