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)


if (obj instanceof Ref) {
      return this.fetchAsync(obj, suppressEncryption);
    }
    return obj;
  }
  async fetchAsync(ref, suppressEncryption) {
    try {
      return this.fetch(ref, suppressEncryption);
    } catch (ex) {
      if (!(ex instanceof MissingDataException)) {
        throw ex;
      }
      await this.pdfManager.requestRange(ex.begin, ex.end);
      return this.fetchAsync(ref, suppressEncryption);
    }
  }
  getCatalogObj() {
    return this.root;
  }
}
export { XRef };