Very weird error with evince, and no real good answer if you Google. The error message is File type application/octet-stream type (application/octet-stream) is not supported.
What I did (perhaps some steps can be skipped):
rm ~/.local/share/mime/mime.cache
rm /usr/local/share/mime/mime.cache
update-mime-database /usr/share/mime
The last step fixed it for me, so not sure I needed the first two.