Attach (recommended) or Link to PDF file here:
http://mariovalle.name/SciViz/1-s2.0-S0097849310001846-main.pdf

Configuration:
- Web browser and its version: Using pdf.js from Node.js through npm package `pdfjs-dist`
- Operating system and its version: Windows 10 64bits
- PDF.js version: 2.6.347
- Is a browser extension: No

Steps to reproduce the problem:
1. Load the file in acrobat
2. In document properties look at the Author field: it is `Samuel Silva; Beatriz Sousa Santos; Joaquim Madeira`
3. Look at  Additional metadata > advanced > dc:creator. It is marked as `seq container` and contains the 3 authors.
4. Using the code below gives: `"Author": "Samuel Silva"` that is, only the first one. And `"dc:creator": "Samuel SilvaBeatriz Sousa SantosJoaquim Madeira"`, that is the three authors squashed together without separators.

What is the expected behavior? (add screenshot)
In both fields the three authors as a single string with some sort of separator between them. Note that other pdf files that contains multiple authors already have them as a single string with names separated by commas.

The code used:
```
var pdfjsLib = require("pdfjs-dist/es5/build/pdf.js");
var pdfPath = "http://mariovalle.name/SciViz/1-s2.0-S0097849310001846-main.pdf";
var loadingTask = pdfjsLib.getDocument(pdfPath);
loadingTask.promise
  .then(function (doc) {
    var lastPromise;
    lastPromise = doc.getMetadata().then(function (data) {
      console.log(JSON.stringify(data.info, null, 2));
      if (data.metadata) {
        console.log(JSON.stringify(data.metadata.getAll(), null, 2));
      }
    });
  });
```
case "apos":
                return "'";
              case "gt":
                return ">";
              case "lt":
                return "<";
              case "quot":
                return '"';
            }
            throw new Error(`_repair: ${name} isn't defined.`);
          });
        let chars = "";
        for (let i = 0, ii = bytes.length; i < ii; i += 2) {
          const code = bytes.charCodeAt(i) * 256 + bytes.charCodeAt(i + 1);
          if (
            code >=  32 &&
            code <  127 &&
            code !==  60 &&
            code !==  62 &&
            code !==  38
          ) {
            chars += String.fromCharCode(code);
          } else {
            chars += "&#x" + (0x10000 + code).toString(16).substring(1) + ";";
          }
        }
        return ">" + chars;
      });
  }
  _getSequence(entry) {