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When I open the PDF in Illustrator, I receive an error that says:
An unknown imaging construct was encountered
This suggests either some kind of file corruption, or perhaps there is some incompatible image format/data in there somewhere. Possibly stuff added by the scanning software?
After clicking OK, the document does finally open, but on further ...
2
The scanner has used clever methods to squeeze the image storage needs to the minimum. There's for ex. a highly compressible extremely unsharp bitmap image which has right color just at the places of the dark brown lines. Inkscape revealed the parts.
Then there's an opacity mask for it which has black (=make transparent) nearly everywhere except it makes ...
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