I'm trying to read a PDF that is on my server-side storage, and upload it to a database

My file structure

So, first I tried to read it with fs.readFileSync():

let file = fs.readFileSync(route)
// returns <Buffer 25 50 44 46 2d 31 2e...

Then, I tried to convert it to a Blob

let blob = new Blob([file], {type:"application/pdf"})

It worked, but it returned an empty pdf file.

I tried to convert it to a File too, but I had the same results:

let blob = new File([file], "file.pdf", {type:"application/pdf"})

What am I doing bad?