Hello

I have posted on nextcloud GIT this issue and they pointed me here.

Here is the issue I have posted - https://github.com/nextcloud/files_pdfviewer/issues/508

Configuration

Web browser and its version: Google Chrome, ver.94.0.4606.81 x64
Operating system and its version: Windows 10, 21H1, build 19043.1288
PDF.js version: v2.9.359
Is a browser extension: no I dont use it as extension

Steps to reproduce the problem:

What is the expected behavior?
Shared PDF created in AutoCAD without borders

![Snímek obrazovky 2021-10-19 120908](https://user-images.githubusercontent.com/11374526/137889425-c0983b5c-a557-46dc-ac32-d50c1dbb9ea9.png)

What went wrong?
Shared PDF created in AutoCAD is with border...
![image](https://user-images.githubusercontent.com/11374526/137888031-11852e03-41a4-48a0-bc0a-3ba0d65bd912.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):
https://cloud.ostritecky.cz/s/cryrqKarK9CEam8

PDF viewer rendering border around text and objects when creating files with AutoCAD and It looks really bad. Is there a way to switch it off ?

Testfile here:

[Test.pdf](https://github.com/mozilla/pdf.js/files/7372181/Test.pdf)

buffer.push("\nendobj\n");
    const newRefs = [{ ref: this.ref, data: buffer.join(""), xfa }];
    if (parentBuffer !== null) {
      newRefs.push({
        ref: this.parent,
        data: parentBuffer.join(""),
        xfa: null,
      });
    }
    return newRefs;
  }
  _getDefaultCheckedAppearance(params, type) {
    const width = this.data.rect[2] - this.data.rect[0];
    const height = this.data.rect[3] - this.data.rect[1];
    const bbox = [0, 0, width, height];
    
    const FONT_RATIO = 0.8;
    const fontSize = Math.min(width, height) * FONT_RATIO;
    
    
    
    let metrics, char;
    if (type === "check") {
      
      metrics = {
        width: 0.755 * fontSize,
        height: 0.705 * fontSize,
      };
      char = "\x33";
    } else if (type === "disc") {