PDF/A-4f (ISO 19005-4:2020, conformance F): PDF/A-4 with embedded files of any kind. The catalog's name dictionary has an
EmbeddedFiles tree, and each embedded file's specification has F and UF, an AFRelationship, and a
stream naming its MIME type; the identification states pdfaid:conformance F.
PdfA4f = 6
ISO 19005-4, 6.7.3 and 6.9 (veraPDF PDF/A-4F validation profile, rules 6.9-1, 6.9-2, 6.9-4 and 6.9-5).