// REFERENCE

OpenDocument (ODT/ODS/ODP) signature

Signature (hex): 50 4B 03 04 (ZIP)

OpenDocument files from LibreOffice are ZIP: they start with 50 4B 03 04. They're identified by the internal mimetype file (e.g. application/vnd.oasis.opendocument.text for an ODT).

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Magic bytes identifier

pdf
PDF signature ole
OLE2 signature (legacy DOC/XLS/PPT/MSI) docx
DOCX/XLSX/PPTX signature rtf
RTF signature epub
EPUB signature ps
PostScript (PS/EPS) signature

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