It is common knowledge.

Bots can scrape PDFs.

I had about 50 applications of proof where bots scraped the information from my PDF and auto-filled it into the next forms which are again simply re-typing in all of the information from your resume again (which most medium or large companies use anyway which makes the entire point moot). They can scrape PDFs unless you hand-write your resume with bad handwriting so the OCR can't pick it up.

Unless they got their ATS system from aliexpress, it can scrape PDFs.