documentclass{article}

usepackage{mathtools}

begin{document}

[
phantom{(17') rightarrowhspace{arraycolsep}}
underbrace{
  bordermatrix{
    hspace{-arraycolsep} &
    overbrace{}^{label2}  &
                           &
    overbrace{}^{label3} cr
     & 1 & 1 & 1 cr
     & 1 & 1 & 1
    }
  }_{text{label1}}
]

end{document}