Open Data Object - Open File attachment within pdf document

I am trying to build a script which will open file attachments embedded in a pdf document.

I have used the following javascript to list all embedded files within a document so I can retrieve the name

var d = this.dataObjects;

for (var i = 0; i < d.length; i++)

console.println("Data Object[" + i + "]=" + d[i].name);

The console reported:

Data Object[0]=MTP-300-X-1210_A.pdf

Data Object[1]=MTP-300-X-1240_A.pdf

I then used the following script to open the file     

this.openDataObject("MTP-300-X-1210_A.pdf");

Console reports back as follows and does not open the file:

[object Doc]

Can anyone please offer assistance in how to open an embedded pdf attachment within a document?

Many thanks!