How to load pdf file with angular

getFileUrl(event) {
        var file = event.target.files[0];
        var myReader: FileReader = new FileReader();
        myReader.onloadend = (e) => {
            let res = myReader.result;
            let formData = new FormData();
            formData.append("formFile", file);
        }
        myReader.readAsArrayBuffer(file);
    }

<input type="file" hidden #fileUpload (change)="getFileUrl($event)" /><mat-icon (click)="fileUpload.click()"> attach_file </mat-icon>