For the import of various PDFs (from Word, Excel, other applications) into Illustrator, an intermediate step using the Affinity Designer program worked for me - I load the PDF into it and export it as a new PDF. This new PDF imports into Illustrator in a much better state (I have a lot of accents in my language and I've found this to be a viable process for getting various PDFs into Illustrator in a meaningfully editable state).
In the attached screenshots, previews of the original PDF in Illustrator, the original PDF in Affinity Designer (in the import settings, it is advisable to turn off "Favour editable text over fidelity" - don't worry, all text - at least in this particular case, will remain fully editable) and a PDF from Affinty Designer loaded into Illustrator. Plus a PDF for testing if you want.
And yes, this particular PDF contains a mix of Arial and Calibri in one text (plus TMR as a title), but that doesn't prevent Affinity from loading it correctly and exporting it in a state that Illustrator can then handle.
For the import of various PDFs (from Word, Excel, other applications) into Illustrator, an intermediate step using the Affinity Designer program worked for me - I load the PDF into it and export it as a new PDF. This new PDF imports into Illustrator in a much better state (I have a lot of accents in my language and I've found this to be a viable process for getting various PDFs into Illustrator in a meaningfully editable state).
In the attached screenshots, previews of the original PDF in Illustrator, the original PDF in Affinity Designer (in the import settings, it is advisable to turn off "Favour editable text over fidelity" - don't worry, all text - at least in this particular case, will remain fully editable) and a PDF from Affinty Designer loaded into Illustrator. Plus a PDF for testing if you want.
And yes, this particular PDF contains a mix of Arial and Calibri in one text (plus TMR as a title), but that doesn't prevent Affinity from loading it correctly and exporting it in a state that Illustrator can then handle.