After uploading a new version of this file to Commons:
https://commons.wikimedia.org/wiki/File:PL_Hudson_Jej_naga_stopa.pdf
it has 0x0 image size. (The initial version reported non-zero size at the moment)
Reverting to the previous version fixed the problem just for few minutes, and then its image size was zeroized as well and reappeared again after an hour.
No problem with this file after upload to test Wikipedia:
https://test.wikipedia.org/wiki/File:PL_Hudson_Jej_naga_stopa-test.pdf
Note: this does not seem to be duplicate of T297942 as unlike
https://commons.wikimedia.org/wiki/File:Guinault_-_Sergent_!_(1881).pdf
this file has correct page numbers.