Batch Automation How to batch underline all text in all pdf files

[uglyphoto]

[h=1]How to batch underline and save all text in all pdf files inside a folder. Is it possible with Photoshop ?[/h]

 

[colleague]

when you open a pdf in photoshop the text does not show as a text-layer
therefor you cannot underline the text automaticly,
so I think that is not possible