doc.save("output_fixed.pdf")
Because these are placeholder names, you won't find a direct "CIDFont F1" file for download. Instead, use these strategies to restore your document: CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
对于多语言环境下的兼容性，一个必须考虑的工具是。这是一个包含CMap资源的软件包，用于支持PDF阅读器（如Poppler引擎）处理CJK字体。这类资源主要用于 开发者场景 ，帮助应用程序正确解析和显示PDF中的东亚文字。 CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
When your PDF reader says it is missing "CID Font F1," it means it cannot find the actual font family hidden behind that specific alias code. Why Is Your PDF Reader Showing This Error? CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download