PDF_JPX_BOX_TOO_SMALL — JPEG2000 box declares an impossibly small size

high PDF_JPX_BOX_TOO_SMALL

What it means

JP2 box header declares a total length less than 8 bytes (the minimum for the size+type header alone).

Why it fires

Spec-conformant boxes are at least 8 bytes; smaller declarations cause the box walker to either loop or read box headers from the middle of the previous box's body, a known evasion shape.

Other PDF heuristics

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