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The phrase "are pdf" is not correct in standard written English as it lacks context and clarity.
It could be used in a sentence where you are identifying or describing something as being in PDF format, but it needs additional information to be complete.
Example: "The documents you requested are PDF files that can be easily downloaded."
Alternatives: "are in PDF format" or "are PDF documents".
Dictionary
are pdf
verb
To convert to PDF format
Exact(8)
All links are pdf.
The favorite formats used by attackers are PDF (targeting Adobe Reader), Flash (targeting Adobe Flash Player), and Microsoft Office files [1, 2].
In fact most of the documents I receive today are PDF file attachments and I have already replaced Adobe's desktop reader with the smaller, faster and free Firefox plug-in called Foxit.
There are PDF downloads of rulings, as well as facts sheets.
All are PDF documents which require Acrobat Reader to view.
Movies S5 S8, Related to Figure 5 Note: These four movies are PDF files that should be viewed with Adobe Acrobat Reader software (and not Preview, for Mac users).
Similar(51)
While shits1 effects on behavior require PDF, those on the molecular clock of the sLNv are PDF-independent, implicating a novel pathway.
Here it is (pdf).
UPDATE: Here it is (pdf).
The format preferred most by respondents was PDF (78.2%).
(Read the charging document here and the affidavit in support of an arrest warrant here; they're PDFs).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com