var _doc = app.activeDocument

var myGroup = _doc.groupItems.add()

var newPath1 = myGroup.pathItems.add()

newPath1.setEntirePath([
    [0, 0],
    [0, 100],
    [100, 100],
    [150, 0],
    [75, -50]
])

var newPath2 = myGroup.pathItems.add()

newPath2.setEntirePath([
    [0, 0],
    [0, 100],
    [100, 100],
    [150, 0],
    [75, -50]
])