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Try https://github.com/pdfcpu/pdfcpu
So if that tool can read it, why not use it for conversion (calling from Go if you prefer)? Or have a look at the source to determine what it does to make the text readable. See also https://github.com/grumpyhome/grumpy
UPDATE: We tried repairing the pdf in question and lo and behold, we got a result. As a tool for the repair we used qpdf (https://github.com/qpdf/qpdf/releases), after that the ledongthuc/pdf library had no hassle reading the data.
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