Consider a simple plot with text:
Show[Plot[x^2, {x, 0, 10}], Graphics[Text[Style["some text", Large], {4, 10}]]]
You can see Mathematica's output on the left and the pdf obtained through "Save Graphic as" on the right (as shown in Preview on Mac OS Mojave, but using Acrobat Reader is the same). Clearly the font in the pdf looks different (kind of bold). I didn't have this problem with the previous version of Mathematica.
Is there any way to render the font in the pdf as it appears in Mathematica's output?