code: func PDFHasImage(path string) bool {
  	cmd := "pdffonts -l 5 %s | tail -n +3 | cut -d' ' -f1 | sort | uniq"
  	out, err := exec.Command("bash", "-c", fmt.Sprintf(cmd, path)).Output()
  	if err != nil {
  		log.Println(err)
  		return false
  	}
  	if string(out) == "" {
  		return true
  	}
  	return false
  }
docs: // PdfHasImage verify if `path` (PDF) has images