Unlike web typography, PDFs usually use font embedding to ensure that they display "identically" on all platforms. To do this, some subset of the intended font

Unlike web typography, PDFs usually use font embedding to ensure that they display "identically" on all platforms. To do this, some subset of the intended font is included in the PDF file. Due to this habit, you probably wouldn't think of a PDF as using Calibri or Georgia. It could use one, the other, or both. Font choice becomes a static thing.