The creator of the PDF forgot to embed the actual font files into the document when saving it. The PDF is now looking for those fonts on your local device, cannot find them, and is falling back on generic internal labels (F1, F2, etc.).
You are likely seeing references to font mappings inside a PDF code or a "cracked" font list, rather than a legitimate, stylized font family called "CID F1."
Older PDF viewers struggle with modern CID font mapping structures. How to Fix CID Font Errors Without Downloading "F1-F7" The creator of the PDF forgot to embed
If your document is displaying blocks or garbled text because it can't find these fonts, try these fixes:
represents the order in which the font was embedded or detected in the document structure. How to Fix CID Font Errors Without Downloading
First, it's important to establish what CID fonts are designed for. Unlike standard fonts, a CID-keyed font is technically a combination of two files: a large CIDFont containing the actual shape data (or glyphs) for all the characters, and a CMap file, which acts as a map to look up those characters.
Check the box that says or "Subset fonts when percent of characters used is less than 100%" . Check the box that says or "Subset fonts
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Look at the list. It will show the placeholder (e.g., F1 ) alongside its actual name (e.g., Helvetica-Bold or MS-Gothic ).
