hi samaelok try below code
//change Pdf_Presets[i].name as per ur preset
var myDoc = app.activeDocument;
var myPage =myDoc.pages;
for (var p=0; myPage.length>p; p++)
{
var pageNumber = myPage[p].name;
exportPdf(pageNumber)
}
//prf preset and jpg preference set as per ur costomer requirement
function exportPdf(pageNumber)
{
var myDoc = app.activeDocument;
var myDocName = myDoc.name;
var myFolder = myDoc.filePath;
var Pdf_Presets = app.pdfExportPresets;
var myBaseName=myDocName.split(".indd")[0];
for(var i=0; i<Pdf_Presets.length; i++)
{
if(Pdf_Presets[i].name == 'Test'){
pdfPreset = app.pdfExportPresets.item(Pdf_Presets[i].name);
}
}
app.pdfExportPreferences.pageRange = pageNumber
app.swfExportPreferences.pageRange = pageNumber;
mypdfFilePath = myFolder + "/" + myBaseName +"_"+pageNumber+ ".pdf";
myFilepdf = new File(mypdfFilePath);
app.activeDocument.exportFile(ExportFormat.pdfType, myFilepdf, false, pdfPreset);
expFile = File( myFolder + '/'+ myBaseName + '_' + pageNumber+ '.jpg' );
app.activeDocument.exportFile( ExportFormat.JPG, expFile, false );
}