How to detect alterations to a JPG image that has been saved as a PDF

I have received a file containing a cancelled bank check that was downloaded from a bank website and saved as a PDF of the screenshot. Upon opening the PDF, it appears that some of the original hand-written text in the image has been altered. I believe this PDfFwas originally saved as a JPG, then altered, then saved as a PDF. Is there any way to determine if indeed the text has been altered in the file? Thanks!

Not easily. The bank's original version may have been a JPEG, then a screenshot was taken of that and saved as a PDF with unknown compression. (really, who saves a screenshot as a PDF?)
You can examine the PDF in a text editor to see what created it. You can open it in Illustrator to see the layer data (which might show tampering).
Beyond that you'd need an imaging forensics expert to look for tampering with the JPEG compressed image data (was it compressed more than once, was something significantly altered)?

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How to detect alterations to a JPG image that has been saved as a PDF

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