Javascript to relink missing link from pdf within same folder within Illustrator

I am trying to figure out a script to relink a linked pdf in Illustrator. Basically my file will have two linked pages from a pdf in illustrator. The file will then export images made from artboards from specific sections in each page. I will be repeating this 250 times so, it would be awesome if I could automate it.

Each images.ai file will be in separate folders, along with the pdf I would like to replace the linked pdf with. Any ideas?

Thank you!

Nevertheless, even though Illustrator doesn't handle multi-page pdfs via script this simply solution works somehow fine on my test files:

d:\test
│
├───folder1
│       ├───artwork.ai
│       └───folder1.pdf
│
├───folder2
│       ├───artwork.ai
│       └───folder2.pdf
│
└───folder3
        ├───artwork.ai
        └───folder3.pdf

It iterates through the folders folder1, folder2, folder3, opens the files artwork.ai and updates the links with folder1.pdf, folder2.pdf and folder3.pdf respectively.

var main_folder = Folder('d:/test');
var dirs = main_folder.getFiles();

for (var i=0; i<dirs.length; i++) {
    var dir = dirs[i];
    if (dir instanceof Folder) update_links(dir);
}

function update_links(dir) {
    var ai_file = File(dir.fullName + '/artwork.ai');
    var doc = app.open(ai_file);
    var pdfs = doc.placedItems;
    var new_pdf = File(dir.fullName + '/' + dir.name + '.pdf');
    for (var i=0; i<pdfs.length; i++) pdfs[i].relink(new_pdf);
    // doc.save();
    // doc.close();
}

Surprisingly it keeps intact original pages of the linked pdfs. Try it.