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Challenge
Solution
Méthode 1 : Extraire les objets

Méthode 2 : strings
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> strings EiUsYX.pdf | findstr CTFREI
/N 12 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD}) /T (Onelots) >> /AAPL:AKAnnotationObject
] /Subtype /FreeText /IC [ 0.9999960 1 1 ] /AP << /N 19 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD}
] /Subtype /FreeText /IC [ 0.999996 1 1 ] /AP << /N 26 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD})
] /Subtype /FreeText /IC [ 0.999996 1 1 ] /AP << /N 33 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD})
] /Subtype /FreeText /IC [ 0.999996 1 1 ] /AP << /N 40 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD})
] /Subtype /FreeText /IC [ 0.999996 1 1 ] /AP << /N 47 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD})
] /Subtype /FreeText /IC [ 0.999996 1 1 ] /AP << /N 54 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD})
] /Subtype /FreeText /IC [ 0.999996 1 1 ] /AP << /N 61 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD})
] /Subtype /FreeText /IC [ 0.999996 1 1 ] /AP << /N 68 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD})
] /Subtype /FreeText /IC [ 0.999996 1 1 ] /AP << /N 75 0 R >> /Contents (CTFREI{L3T'5_C0NTR0L_TH3_W0RLD})