foreach($pdfs as $pdf){
    //Set the first field for check and use
    $field = get_field($pdf);
    //Set the second field
    $field2 = str_replace('pdf', 'pdf_name', $pdf);
    //If field is set then echo
    if($field) {
        echo "<li><img src='wp-content/themes/peachment/images/pdf.png' /><a href='"
        . $field . "'>" . get_field($field2) . "</a></li>";
    }
}