It's a thesis from a university publication catalogue, and the file name might be just conforming to some kind of a guideline from their university library.

"Gradu" is a common shorthand for "pro gradu" which is the term used in Finland for a master's thesis. The numbers might just be some kind of an id. Many other theses from the same archive also seem to follow some kind of a similar (though not quite identical) pattern in their file names.

It's not the most descriptive file name but it might not be the author's choice.

I’m not blaming the author at all. But surely the server administrator could map the file path onto a nicer name?