This looks like a bug in poppler.
pdfimages -f 1 -l 1 icse98.pdf x
creates x-000.pbm
display x-000.pbm
also shows the image flipped vertically.
** Package changed: gscan2pdf (Ubuntu) => poppler (Ubuntu)
** Changed in: poppler (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1217022
Title:
Gscan Mysteriously Flips PDFs vertically
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