The string appears to be a concatenation of Serbian/Croatian words: "da nam budu jasniji" (so they are clearer to us) "nekapitan" (non-captain) or "jana na severe" (Jana in the north)
The filename was 46 characters long: danambudujasnijanekapitanjanaseverepdf. No metadata. No author. No creation date. Just the file. danambudujasnijanekapitanjanaseverepdf
The mixture of "Kapitan" and "Jana" points strongly toward Indonesian/Malay or South Slavic languages. The string appears to be a concatenation of
Logline: A linguist discovers a corrupted file named "danambudujasnijanekapitanjanaseverepdf" — and realizes it’s a message from a dying language. No creation date
The specific title you're looking for, "Da nam budu jasnije" (so that they may be clearer to us), appears to be a religious or instructional piece, likely related to the teachings of Kapetan Jana Severe (Captain Jana Severe).