Unrecognized Chinese characters and random files in my iPhone's Files app

So,, I was looking at my files app when I noticed thousands, I mean THOUSANDS of files that I didn’t put there, such as files containing resemblance of Chinese letters. And this honestly kinda scares me, because what if it is some form of malware, as well as just random letters and numbers I did not put as files, is this normal?

[Re-Titled by Moderator]

Original Title: Files App