PDF_CFF_HEADER_TRUNCATED — CFF font header is truncated or malformed

medium PDF_CFF_HEADER_TRUNCATED

What it means

CFF font header is structurally invalid: header size out of range, or header runs past the stream length.

Why it fires

Different font rasterisers handle truncated CFF headers differently — some abort, some pad with zeros and continue — leading to divergent glyph rasterisation between scanner and viewer.

Other PDF heuristics

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