Cidfont F1 F2 F3 F4 F5 F6 Full

When a PDF is created and a CIDFont is embedded without a predefined PostScript name, the PDF writer (e.g., Adobe Acrobat, Ghostscript, or a print driver) generates a synthetic font name. The format is:

CIDFont + [Subtype] + [Unique Identifier]

For example:

The F1, F2... F6 designation is not a font family or style. It is a placeholder prefix that the PDF processor assigns dynamically. Typically: cidfont f1 f2 f3 f4 f5 f6 full

The "full" in our keyword cidfont f1 f2 f3 f4 f5 f6 full implies a desire for fully embedded (not subset) versions of all six synthetic fonts. When a PDF is created and a CIDFont

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Cause: The original PDF expects a font named exactly CIDFont+F2, but that name is only a reference.
Solution: Rename the font inside the PDF using a tool like cpdf (Coherent PDF) or use Ghostscript to re-embed with a standard base font: For example:

cpdf -replace-fonts "CIDFont+F2" "NotoSansCJKjp-Bold" in.pdf -o out.pdf

Adobe Illustrator, when saving a PDF with "Create Acrobat Layers" or "Preserve Illustrator Editing Capabilities," will sometimes map internal graphic styles to different synthetic CIDFonts. Complex vector illustrations with multiple text boxes—each using a different style (bold, italic, condensed)—may show F1=Regular, F2=Bold, F3=Italic, F4=BoldItalic, F5=Condensed, F6=CondensedBold.