I got
Request from 176.207.117.69 via cp3038 frontend, Varnish XID 415308351 Upstream caches: cp3038 int Error: 429, Too Many Requests at Wed, 16 Oct 2019 14:06:59 GMT
while trying to access other resolutions for https://commons.wikimedia.org/wiki/File:A_Universal_Code_of_Conduct_-_with_input_from_the_CEE_communities.pdf for pages from 7 on, which fail to render in any resolution, but are correctly displayed in the PDF when you download it.