Open the PDF or file in a tool like:

CAD software uses SHX fonts for technical drawings, but when exporting to PDF, it often maps internal symbol sets to F4 (symbols), F5 (Greek), F6 (user-defined). Install the to fix this.

May 2026 Tested on: Windows 11, macOS Ventura, Ubuntu 24.04 Tools used: VirusTotal, Ghostscript 10.04, Noto Sans CJK v2.004