Attach (recommended) or Link to PDF file here:
[test.pdf](https://github.com/mozilla/pdf.js/files/6715502/test.pdf)

Configuration:
- Web browser and its version: Google Chrome Version 91.0.4472.114 
- Operating system and its version: Windows 10 Enterprise
- PDF.js version: 
- Is a browser extension: yes

Steps to reproduce the problem:
1. download file
2. open file



What is the expected behavior? (add screenshot)
show symbol
![image](https://user-images.githubusercontent.com/50500976/123409847-55ca8800-d5b7-11eb-9e5b-c7f3b33c00e1.png)

What went wrong? (add screenshot)
Does not show symbol
![image](https://user-images.githubusercontent.com/50500976/123409707-274cad00-d5b7-11eb-9a64-b11dcf3cdc3f.png)
Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): Latest Version Chrome extension

const header = file.peekBytes(4);
  return bytesToString(header) === "ttcf";
}
function isOpenTypeFile(file) {
  const header = file.peekBytes(4);
  return bytesToString(header) === "OTTO";
}
function isType1File(file) {
  const header = file.peekBytes(2);
  
  if (header[0] === 0x25 && header[1] === 0x21) {
    return true;
  }
  
  
  if (header[0] === 0x80 && header[1] === 0x01) {
    return true;
  }
  return false;
}
/**
 * Compared to other font formats, the header in CFF files is not constant
 * but contains version numbers. To reduce the possibility of misclassifying
 * font files as CFF, it's recommended to check for other font formats first.
 */
function isCFFFile(file) {