PDF_U3D_HEADER_MISSING — U3D stream missing or wrong File Header block

high PDF_U3D_HEADER_MISSING

What it means

An embedded U3D (3D-model) stream does not start with the required File Header block — a malformed/parser-divergence shape on a rarely-inspected attack surface.

Why it fires

ECMA-363 requires the first U3D block to be the File Header. A different first block is a parser-divergence shape on a low-traffic attack surface that few static analysers cover deeply. Truncated streams that fail to contain even the 30-byte minimum header are reported under this same rule.

Other PDF heuristics

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