Link to PDF file (or attach file here):
[pages4.pdf](https://github.com/mozilla/pdf.js/files/1128300/pages4.pdf)

Configuration:
- Web browser and its version: Firefox 54
- Operating system and its version: Win 10
- PDF.js version: 1.8.522
- Is an extension: no

What is the expected behavior? (add screenshot)
![chrome1-1 1](https://user-images.githubusercontent.com/146436/27918380-2f74512a-6245-11e7-8525-d0038fa6c2e8.jpg)
![chrome1-2 1](https://user-images.githubusercontent.com/146436/27918425-54f8e47e-6245-11e7-9bff-127f79ad0511.jpg)


What went wrong? (add screenshot)
![screenshot from 2017-07-06 12-10-30](https://user-images.githubusercontent.com/146436/27918442-5d57624e-6245-11e7-9436-5ba31cc8bd1a.png)
![screenshot from 2017-07-06 12-10-44](https://user-images.githubusercontent.com/146436/27918454-63b486da-6245-11e7-9eb5-c03aa5c40943.png)



assert(typeof str === "string", "Invalid argument for stringToBytes");
  const length = str.length;
  const bytes = new Uint8Array(length);
  for (let i = 0; i < length; ++i) {
    bytes[i] = str.charCodeAt(i) & 0xff;
  }
  return bytes;
}
/**
 * Gets length of the array (Array, Uint8Array, or string) in bytes.
 * @param {Array<any>|Uint8Array|string} arr
 * @returns {number}
 */
function arrayByteLength(arr) {
  if (arr.length !== undefined) {
    return arr.length;
  }
  assert(arr.byteLength !== undefined, "arrayByteLength - invalid argument.");
  return arr.byteLength;
}
/**
 * Combines array items (arrays) into single Uint8Array object.
 * @param {Array<Array<any>|Uint8Array|string>} arr - the array of the arrays
 *   (Array, Uint8Array, or string).
 * @returns {Uint8Array}
 */
function arraysToBytes(arr) {