I have similar issue, on iOS 16 and previous PDF rendering was working pretty fine.
After upgrade to iOS 17+ (issue is also replicating on iOS 17.1.1), some specific fonts on PDFs are displaying as black boxes (when the font color is set to black).
bpaiva
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@lisandr0, did your issue got solved updating iOS to the latest (17.1.1) ?
For me, problem is still happening.
Problem still happening on iOS 17.2. Fonts are displaying incorrectly.