My javascript doesnt work on big files

i have basic javascript asks pagenumber , name. extracts pagenumber document , names it. works fine on small documents when use on big document (12mb) doesnt work.

 

var page = app.response("which page u want extract?")

 

var name = "../" + app.response("what u want name to?") + ".pdf"

 

this.extractpages(page-1,page-1,name)

what "doesn't work" mean, exactly? happens when run on large file?

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