Attach (recommended) or Link to PDF file here:  [test.pdf](https://akmer.aikucun.com/a94a8fe5ccb19ba61c4c0873d391e987982fbbd3_1616477914120_83.pdf)


Configuration:
- Web browser and its version: chrome 87.0.4280.88
- Operating system and its version: windows10
- PDF.js version: 2.6.347
- Is a browser extension:

Steps to reproduce the problem:
1. just open 

What is the expected behavior? (add screenshot)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/17724610/112087066-473f8f80-8bc8-11eb-8efb-56139ec42a9c.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

}
    this.nextChunk = this.str.getBytes(chunkSize);
    var hasMoreData = this.nextChunk && this.nextChunk.length > 0;
    var decrypt = this.decrypt;
    chunk = decrypt(chunk, !hasMoreData);
    var bufferLength = this.bufferLength;
    var i,
      n = chunk.length;
    var buffer = this.ensureBuffer(bufferLength + n);
    for (i = 0; i < n; i++) {
      buffer[bufferLength++] = chunk[i];
    }
    this.bufferLength = bufferLength;
  };
  return DecryptStream;
})();
var Ascii85Stream = (function Ascii85StreamClosure() {
  
  function Ascii85Stream(str, maybeLength) {
    this.str = str;
    this.dict = str.dict;
    this.input = new Uint8Array(5);
    
    
    if (maybeLength) {
      maybeLength = 0.8 * maybeLength;
    }
    DecodeStream.call(this, maybeLength);
  }
  Ascii85Stream.prototype = Object.create(DecodeStream.prototype);