For what it's worth the virustotal page[0] for the sha256 hash[1] of the pdf file has it marked as "File distributed by Apple" so it must have been known for some time now? Would be interesting to know when that notice was added but there is no archive of the site unfortunately.

[0] https://www.virustotal.com/gui/file/b1674191a88ec5cdd733e424...

[1]b1674191a88ec5cdd733e4240a81803105dc412d6c6708d53ab94fc248f4f553