As Bernd says you can collect the page boxes via JS but nothing about the color spaces, graphic objects or fonts.
For example to see the dimensions of the media box, use this in the JS console:
var aRect = this.getPageBox("Media");
var width = aRect - aRect;
var height = aRect - aRect;
console.println("Page 1 has a width of " + width + " and a height of " + height);
The valid PageBox names are Art, Bleed, BBox, Crop (default) and Trim. The results are reported in Points (1/72 inch).
You can find the total number of pages in a document using this.numPages and the current page with this.pageNum
Thanks for Prompt response.
Is there is no way to access or get Preflight Page information..?