Since you can't download the fonts, you must use one of these workarounds to make the PDF readable again:
Google Noto Sans CJK and Noto Serif CJK are open-source, support CID mapping, and cover F1–F7 styles.
When a PDF or a CAD drawing is created, the software sometimes fails to embed the full font name. Instead, it assigns a tag.
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Since you can't download the fonts, you must use one of these workarounds to make the PDF readable again:
Google Noto Sans CJK and Noto Serif CJK are open-source, support CID mapping, and cover F1–F7 styles. cid font f1 f2 f3 f4 f5 f6 f7 fonts free download link
When a PDF or a CAD drawing is created, the software sometimes fails to embed the full font name. Instead, it assigns a tag. Since you can't download the fonts, you must