When uploading a PDF to archive.org you may get an error that states:

Uploaded content is unacceptable. Syntax error detected in pdf data. You may be able to repair the pdf file with a repair tool, pdftk is one such tool.

I found this post which provides a ghostscript command that worked for me on Linux:

gs -o fixed.pdf -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress corrupted.pdf