What is this wikimirror.org? Why change links to that?

So this list is exhaustive. I went through all PDFs and Djvu files on Wikimedia Commons as of previous week. Not just a random example. if we fix these, then all of them will be fixed. :-)

No, this one seems just a slightly broken PDF. I just fixed it.

that's odd, I saved the pdf file starting from a Word document. (Ok, at a second thought that's not odd at all :-) ) Thanks!

So I fixed it using mutool clean. But the ones I listed above cannot be fixed this way. And this is what I am reporting. So mutool clean does not fix it, looking at MediaBox values show reasonable page sizes (including the first page), and even metadata (example for the first file above shows page size available:

{
    "name": "pdf-PageSize",
    "value": [
        {
            "name": 0,
            "value": "612 x 792 pts (letter)"
        },
        {
            "name": 1,
            "value": "697 x 855 pts"
        }
    ]
}

But Mediawiki does not show width and height. So something is wrong.

@mau If you made this PDF yourself, could I recommend removing the first blank page? Because otherwise the first thumbnail does not show anything.

@Mitar probably it's even better to substitute the first page with the actual cover for the book, indeed. I proceed :-)

I ran into the same problem. I don't know if this can be considered a solution, because these steps have to be done on the server side, but I solved my problem:

1. step – repair thumbnails for files of the core MediaWiki

php maintenance/refreshImageMetadata.php --verbose --mime image/vnd.djvu --force

1. step – do null edit of the index pages by Extension:Proofread_Page (need for actualization info about the pages count for special page)

php maintenance/refreshLinks.php --namespace 252