Late to this party as we have just hit this issue. If I remember correctly, CorelDraw had an option to import a PDF as curves, so it converted the embedded fonts to curves on import, giving a visually identical, but not editable, PDF page import. From what I can see, AP rasterises the 'Placed' PDF which mostly looks OK, but doesn't seem to be as efficient a solution to importing PDFs without their fonts.
I have found an option in Foxit PDF Editor to convert a PDF to curves: Edit Object > Text > Select text strings (Ctrl+A to select all) > Convert to Shape
- but it would be nice to have that as an option on PDF import into AP.