A search for the exotic decay of the Higgs boson to a pair of light pseudoscalar $a$ bosons is performed in the final state with two muons and two taus. The motivation lies in models beyond the standard model, such as two-Higgs-doublet models extended with a complex singlet (2HDM+S). The results are based on an integrated luminosity of 19.7~\mathrm{fb}^{-1}, accumulated by the CMS experiment at LHC in 2012 at 8 TeV center-of-mass energy. Masses of the pseudoscalar boson between 20 and 62.5 GeV are probed, and upper limits between 4 and $15\%$ are set on the branching fraction of the Higgs boson to two light pseudoscalar bosons, under the hypothesis that the pseudoscalar $a$ does not decay to quarks.

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