I have binary data, please check this link

I try to download as PDF file and show above data, But file is downloading when I going to open the file I am getting a error as a dialog

We can't open this file
  Something went wrong

here is the code what I tried, So how can I fix this problem

let binaryString = btoa(unescape(encodeURIComponent(above_binary_data)))
    
   let binaryLen = binaryString.length;
    
   let bytes = new Uint8Array(binaryLen);
    
    for (let i = 0; i < binaryLen; i++) {
       let ascii = binaryString.charCodeAt(i);
       bytes[i] = ascii;
    }
    
  let blob = new Blob([bytes], {type: "application/pdf"});
    
  let link = document.createElement('a');
    
  link.href = window.URL.createObjectURL(blob);
  link.download = 'test_pdf';
    
  link.click();

I have use pure HTML file for all these process