We could use:
https://github.com/mozilla/pdf.js/blob/c3d08580627471432a6ad0b2fdb948df64126afa/src/display/api.js#L929

and look at bit 4.

The following pdf:
https://orimi.com/pdf-test.pdf
is not editable in neither Acrobat nor Edge nor Foxit and nor Okular.
if (zoomDisabledTimeout) {
    clearTimeout(zoomDisabledTimeout);
  }
  zoomDisabledTimeout = setTimeout(function () {
    zoomDisabledTimeout = null;
  }, WHEEL_ZOOM_DISABLED_TIMEOUT);
}
function webViewerWheel(evt) {
  const { pdfViewer, supportedMouseWheelZoomModifierKeys } =
    PDFViewerApplication;
  if (pdfViewer.isInPresentationMode) {
    return;
  }
  if (
    (evt.ctrlKey && supportedMouseWheelZoomModifierKeys.ctrlKey) ||
    (evt.metaKey && supportedMouseWheelZoomModifierKeys.metaKey)
  ) {
    
    evt.preventDefault();
    
    if (zoomDisabledTimeout || document.visibilityState === "hidden") {
      return;
    }
    
    
    
    const deltaMode = evt.deltaMode;