Document Viewer (Evince) history navigation
As of Evince 3.32, the key bindings are Alt + P and Alt + N. I cannot find the toolbar button anymore.
Reference: https://gitlab.gnome.org/GNOME/evince/issues/770
Under Evince 3.4 you can activate a "back" button by editing the toolbar (Edit → Toolbar; drag and drop functions to toolbar):
I don't think there's any hotkey by default but you might be able to add a custom one.
If you're looking for customization you might be better off with a PDF viewer like Okular or qpdfview anyway. Both should offer the function you're searching for.