Height change only in the document

I think you can achieve that by setting a page size. 

If you're on windows see slides: 

But if you're looking for a script, below are two different cases that I used trying to help another user in the forums a while ago.

In the example below I was using this script with the Action Wizard tool, not from a button, but you can also use it with a button Mouse-Up action. I am not sure who this original script belongs to for the proper credit (maybe Thom Parker).

/* Put script title here */
var rCrop = this.getPageBox("Crop",this.pageNum); 
rCrop[0] += 8.5; // Adjust Left Side 
rCrop[1] -= 5.7; // Adjust Top Side 
rCrop[2] -= 0; // Adjust Right Side 
rCrop[3] += 0; // Adjust Bottom Side 
this.setPageBoxes("Crop",this.pageNum,this.pageNum,rCrop);

var pp = this.getPrintParams();
pp.interactive = pp.constants.interactionLevel.manual;
pp.printerName = "Epson L805 Series";
this.print({bUI: true, nStart: this.pageNum})

Here's another case example that I've used with the guidance of some examples found in the Adobe Acrobat API Reference:

var pp = this.getPrintParams();
//pp.firstPage = 0;
//pp.lastPage = 24;
pp.interactive = pp.constants.interactionLevel.automatic;
pp.DuplexType = pp.constants.duplexTypes.DuplexFlipLongEdge;
pp.pageHandling = pp.constants.handling.fit;
pp.printerName = "Adobe PDF";
//if (this.getField("CH.6").value == "Yes") {this.print(false, 11,16)};
//this.print(pp);
if (this.getField("CH.6").value == "Yes") {this.print({bUI: false, nStart: 11, nEnd: 16,})};