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We report the near-IR detection of a prominent CIV absorption in therest-frame UV spectrum of the most distant known QSO, SDSS J104433.04-012502.2,at z=5.80. This QSO was recently observed with XMM-Newton and it was found tobe notably X-ray weak. The equivalent width of the CIV absorption feature (~10A) strongly supports the idea that the X-ray faintness of this QSO is due toheavy absorption by gas with a column density N_H > 10^{24} cm^-2. The shape ofthe CIV feature suggests that this is a Broad Absorption Line QSO. Althoughabsorbed by a huge column of gas, the observed continuum in the 0.9-2.4um range(~1300-3500 A rest frame) exactly matches the template of unabsorbed QSOswithout invoking any reddening (E(B-V)<0.08 mag), indicating that dust in theabsorbing gas is either absent or composed of large grains.Comment: 4 pages, 2 figures, accepted for publication in A&A Letter

Discovery of strong CIV absorption in the highest redshift quasar