Trying to read a pdf file using PDFJS.getDocument function. The pdf worker is throwing


UnknownErrorException {
 name: "UnknownErrorException", 
 message: "Invalid root reference", 
 details: "FormatError: Invalid root reference"
}

The error can be easily reproduced calling PDFJS.getDocument(pdfUrl) using the attached pdf
[110229_10312017_6810306.pdf](https://github.com/mozilla/pdf.js/files/1444166/110229_10312017_6810306.pdf)


const TAB = 0x9,
      LF = 0xa,
      CR = 0xd,
      SPACE = 0x20;
    const PERCENT = 0x25,
      LT = 0x3c;
    function readToken(data, offset) {
      let token = "",
        ch = data[offset];
      while (ch !== LF && ch !== CR && ch !== LT) {
        if (++offset >= data.length) {
          break;
        }
        token += String.fromCharCode(ch);
        ch = data[offset];
      }
      return token;
    }
    function skipUntil(data, offset, what) {