Getting Pdf Page Ordering

i have pdf document in page numbers of preface not in proper order

i.e. $i, _,$ $iii, iv, v, _, vii, _ , ix ,$ $x , xi, xii , xiii, _ , xiv ... , on$

what have find missing page number , insert blank page @ location of missing page.

the page numbers in numerals followed preface numbered.

i trying of java script not able get solutions.

i not able retieve page numbers present in pdf document.

looking forward answers .

thanks in advance

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