Get previously uploaded pdf file using meta in wordpress

Here is the code 

Add the following code in your functions.php file 

add_action("admin_init", "pdf_init");
add_action('save_post', 'save_pdf_link');
function pdf_init(){
 add_meta_box("my-pdf", "PDF Document", "pdf_link", "post", "normal", "low");
function pdf_link(){
 global $post;
 $custom  = get_post_custom($post->ID);
 $link    = $custom["link"][0];
 $count   = 0;
 echo '<div class="link_header">';
 $query_pdf_args = array(
   'post_type' => 'attachment',
   'post_mime_type' =>'application/pdf',
   'post_status' => 'inherit',
   'posts_per_page' => -1,
 $query_pdf = new WP_Query( $query_pdf_args );
 $pdf = array();
 echo '<select name="link">';
 echo '<option class="pdf_select">SELECT pdf FILE</option>';
 foreach ( $query_pdf->posts as $file) {
    if($link == $pdf[]= $file->guid){
    echo '<option value="'.$pdf[]= $file->guid.'" selected="true">'.$pdf[]= $file->guid.'</option>';
    echo '<option value="'.$pdf[]= $file->guid.'">'.$pdf[]= $file->guid.'</option>';
 echo '</select><br /></div>';
 echo '<p>Selecting a pdf file from the above list to attach to this post.</p>';
 echo '<div class="pdf_count"><span>Files:</span> <b>'.$count.'</b></div>';
function save_pdf_link(){
 global $post;
 if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE){ return $post->ID; }
 update_post_meta($post->ID, "link", $_POST["link"]);
add_action( 'admin_head', 'pdf_css' );
function pdf_css() {
 echo '<style type="text/css">
   border-top:solid 1px #e5e5e5;
   padding:6px 6px 6px 12px;
   margin:0px -6px -8px -6px;
   -moz-border-radius:0px 0px 6px 6px;
   -webkit-border-radius:0px 0px 6px 6px;
   border-radius:0px 0px 6px 6px;
 .pdf_count span{color:#666;}
function pdf_file_url(){
 global $wp_query;
 $custom = get_post_custom($wp_query->post->ID);
 echo $custom['link'][0];

Goto Dashboard and add new post, you can able to see the options look below 

Getting the pdf

in your single.php file add the following code

<a href="<?php pdf_file_url(); ?>">My PDF File</a>

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