To ensure you are getting a verified, clean, and free file, stick to well-established, reputable typography repositories rather than obscure direct-download links.
Furthermore, the pursuit of "free" fonts carries significant legal and security risks. High-quality CIDFonts, especially those capable of professional typesetting, are frequently commercial products licensed by foundries such as Adobe. Downloading these from third-party "free font" repositories often constitutes copyright infringement. From a security perspective, "verified" is a subjective term on the internet. Files masquerading as font files (.ttf or cidfont f4 font verified free download
Your PDF viewer cannot interpret the CID character map used by the document creator. To ensure you are getting a verified, clean,