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Level 4

it may not be quite right for your workflow but there is the app.opendoc function that allows you to trigger the opening of a pdf from a livecycle forms event  - (say a checkbox click event)

so that you could have a button or whatever for "go back to form" and script the click event with the app.opendoc command

app.openDoc("EXAMPLEfilename.pdf"); -

hope that helps