Attach (recommended) or Link to PDF file here:
PDF from #4106, https://mail.gnome.org/archives/evince-list/2013-November/pdfNC0hkVW67a.pdf.

Steps to reproduce the problem:
1. Open the PDF

What is the expected behavior?
![immagine](https://user-images.githubusercontent.com/1616846/121865567-67ca4200-ccfe-11eb-8673-1d6e863fc8d5.png)

What went wrong?
The PDF doesn't load, `TypeError: can't access property Symbol(), match is null` error is logged in the console.
"postSign",
      "postSubmit",
      "preExecute",
      "preOpen",
      "prePrint",
      "preSave",
      "preSign",
      "preSubmit",
      "ready",
      "validationState",
    ]);
    this.id = attributes.id || "";
    this.listen = getStringOption(attributes.listen, [
      "refOnly",
      "refAndDescendents",
    ]);
    this.name = attributes.name || "";
    this.ref = attributes.ref || "";
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.extras = null;
    
    this.encryptData = null;
    this.execute = null;
    this.script = null;
    this.signData = null;
    this.submit = null;
  }
}
class ExData extends ContentObject {