A font must be installed in order for it to be recognized and embedded in a PDF file. Simply unzipping a font doesn't install it. If you are on Windows, right click on the font file and choose the Install for all users option. On MacOS, use Font Book to add fonts (File=>Add fonts).
There are two other necessary conditions to embed a font within a PDF file:
(1) The font must allow embedding for at least Preview and Print.
(2) There must be text already in the PDF file that references that font in which case you must use Acrobat Pro DC Preflight to embed the font. Alternatively, the font can be embedded if you are adding new text via the edit function and have selected the font (already installed on your system) from the list of available fonts.