[`http://www.ei.ruhr-uni-bochum.de/media/crypto/veroeffentlichungen/2010/08/08/baileypaaroefjc.pdf`](http://www.ei.ruhr-uni-bochum.de/media/crypto/veroeffentlichungen/2010/08/08/baileypaaroefjc.pdf) is severely mis-rendered by the version of pdf.js bundled with Firefox 38.0.5:

![screen shot of misrendered PDF using pdf.js](https://cloud.githubusercontent.com/assets/325899/8235479/3876046e-15b0-11e5-97c0-ecbb5d9f8ee8.png)

You can see that practically every word has some blanks where letters should be.

Note that Adobe Reader (11.0.09) does a _better_ job of rendering but still has many missing characters, and throws up an error message about a font that it "cannot extract", so the PDF itself may be ill-formed (in which case pdf.js should give an error message too).

![screen shot of the same PDF with Adobe Reader 11.0.09](https://cloud.githubusercontent.com/assets/325899/8235615/da33e866-15b0-11e5-96a2-8b9f15c6f74d.png)

const bytes = this.bytes;
      const format = bytes[pos++];
      const fdSelect = [];
      let i;
      switch (format) {
        case 0:
          for (i = 0; i < length; ++i) {
            const id = bytes[pos++];
            fdSelect.push(id);
          }
          break;
        case 3:
          const rangesCount = (bytes[pos++] << 8) | bytes[pos++];
          for (i = 0; i < rangesCount; ++i) {
            let first = (bytes[pos++] << 8) | bytes[pos++];
            if (i === 0 && first !== 0) {
              warn(
                "parseFDSelect: The first range must have a first GID of 0" +
                  " -- trying to recover."
              );
              first = 0;
            }
            const fdIndex = bytes[pos++];
            const next = (bytes[pos] << 8) | bytes[pos + 1];
            for (let j = first; j < next; ++j) {
              fdSelect.push(fdIndex);
            }
          }