The font is "subsetted" or poorly embedded in the PDF, meaning the document expects the viewer to have the font installed, or the viewer cannot properly map the CID codes to glyphs (the actual images of the characters).
Open the document in your PDF reader or original editing software. Select . cidfontf4 font free download patched
To help narrow down the exact issue with your document, let me know: What are you using to open or create the file? The font is "subsetted" or poorly embedded in
If you have access to the original source file (Word, InDesign), re-export the PDF using a different setting. cidfontf4 font free download patched