var mobileCheck = PDFTron.WebViewer.prototype.isMobileDevice;
PDFTron.WebViewer.prototype.isMobileDevice = function() {
if (location.search.toLowerCase().indexOf('disablemobile') === -1) {
return mobileCheck.call(this); // or add your own code here
}
return false;
};
var myWebViewer = new PDFTron.WebViewer(...