// REFERENCE

PostScript (PS/EPS) signature

Signature (hex): 25 21 50 53 (%!PS) Medium risk

A PostScript file starts with 25 21 50 53 (%!PS). It's a full programming language, not just a page format, so interpreters (Ghostscript) have suffered command-execution flaws.

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pdf
PDF signature ole
OLE2 signature (legacy DOC/XLS/PPT/MSI) docx
DOCX/XLSX/PPTX signature rtf
RTF signature epub
EPUB signature odt
OpenDocument (ODT/ODS/ODP) signature

Signatures verifiable with CyberEscudo's magic-bytes identifier. Educational content.