Manually change the text font in your editor to Arial or Myriad Pro , which are the most common matches for these CID labels.
Check the document properties in Adobe Acrobat (File > Properties > Fonts) to see if the "Actual Font" is listed next to the F1-F4 labels. cid font f1 f2 f3 f4 free link download
: If you only need to view or print the file (not edit the text), you can convert the text to shapes. In Illustrator, go to Object > Flatten Transparency and check Outline Text . Manually change the text font in your editor