my website owner tools lists plenty of (malicious) backlinks with invalid figures:

%EE%80%80

and

%EE%80%81

so my links frequently seem like this:

domain dot com/pdf/%EE%80%80sometext%EE%80%81moretext.pdf

or

domain dot com/pdf/sometext%EE%80%80moretext%EE%80%81moretext.pdf

Edit: I have to remove these invalid figures to obtain:

domain dot com/pdf/sometextmoretext.pdf

or

domain dot com/pdf/sometextmoretextmoretext.pdf