Searching for "CIDFont+F1" often leads to frustration because these aren't actually names of fonts you can download and install. They are generic placeholder labels
If your PDF is displaying boxes or strange symbols because of these missing fonts, try these methods: cid font f1 f2 f3 f4 f5 f6 f7 fonts free download link
These fonts are designed to be compatible with the Adobe CID fonts and are available under open-source licenses. cid font f1 f2 f3 f4 f5 f6 f7 fonts free download link
If your PDF says "Missing CID Font" and shows a blank page, it’s usually because the document uses Chinese, Japanese, or Korean (CJK) characters. The Fix: Download the Adobe Acrobat Reader DC Font Pack. cid font f1 f2 f3 f4 f5 f6 f7 fonts free download link