try below code, i modifide sample cone provide adobe as per ur requirement.
main();
function main(){
//var myCounter = 1;
var myDocument = app.documents.item(0);
var myPage = myDocument.pages;
var myPDFFile = new File("E:\\Work\\Scripting InDesign CS3-4 with JavaScript April 2009.pdf");
if((myPDFFile != null)){
for (var p=0; myPage.length>p; p++){
myPlacePDF(myDocument, myPage[p], myPDFFile);
}
}
}
function myPlacePDF(myDocument, myPage, myPDFFile){
var myPDFPage;
app.pdfPlacePreferences.pdfCrop = PDFCrop.cropMedia;
var myCounter = 1;
var myBreak = false;
while(myBreak == false){
if(myCounter > 1){
myPage = myDocument.pages.add(LocationOptions.after, myPage);
}
app.pdfPlacePreferences.pageNumber = myCounter;
myPDFPage = myPage.place(File(myPDFFile), [0,0])[0];
myPDFPage.verticalScale =77;
myPDFPage.horizontalScale = 77;
if(myCounter == 1){
var myFirstPage = myPDFPage.pdfAttributes.pageNumber;
}
else{
if(myPDFPage.pdfAttributes.pageNumber == myFirstPage){
myPage.remove();
myBreak = true;
}
}
myCounter = myCounter + 1;
}
}