DURING VECTORS TO A FOREIGN ARPT; LGT HAD TERRAIN WARNING FOLLOWED BY GPWS PULL UP WARNING.

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WE WERE ON DSCNT TO GVA FOR RWY 23. BEFORE SPR (ARR FROM NW; CDG GVA); RWY CHANGED TO 05. VECTORS TO DOWNWIND (AFTER INITIAL DIRECT PAS). DSND TO 9000 THEN 7000'. AFTER PROGRAMMING FMC FOR NEW APCH; I TRIED TO CONTACT COMPANY ON NEW FREQ WITH NO LUCK. NOTICED COPLT OVER 250 KTS BELOW 10000' BUT WAS SLOWING. APCHING 7000' (ABOUT 7100'); GPWS ACTIVATED WITH 'TERRAIN; TERRAIN;' THEN 'WHOOP WHOOP PULL UP.' WE WERE AT A VERY LOW SINK RATE AND 250 KTS APCHING 7000' WHEN IT ACTIVATED. WE WERE IN WX; NO VIS. COPLT REACHED FOR AUTOFLT PANEL TO CLB (WE WERE ON AUTOPLT). I YELLED; 'CLB NOW;' VERY FORCEFULLY. WHEN THERE WAS NO IMMEDIATE RESPONSE; I HIT AUTOPLT DISCONNECT AND PULLED UP. GPWS STOPPED AND WE LEVELED ABOUT 9200'. I EXPLAINED OUR CLB TO GVA APCH. HE SAID WE HAD HAD SUFFICIENT TERRAIN CLRNC. FURTHER APCH WAS UNEVENTFUL. OUR APCH CHART SHOWS A 5575' POINT NORTH OF PAS. THE DEP CHART SHOWS A 5637' POINT IN GENERAL AREA. I DON'T KNOW WHAT IS JUST BEYOND EXPANDED AREA. OUR AREA CHART SHOWS AN 8000' MINIMUM AREA BUT NO TERRAIN. ONE CABIN ATTENDANT WAS SLIGHTLY INJURED ON PULL UP (BRUISED REAR). OBSERVATIONS: COPLT ADMITS HE FROZE IN AUTO MODE. THIS REALLY UPSET HIM PAX REACTED WELL AFTER I PROMPTLY EXPLAINED SITUATION ON P/A. I HAVE NO REASON TO BELIEVE GPWS WARNING VALID; BUT I STILL DON'T KNOW. BOTH COPLT AND I THOUGHT WE HAD CLIMBED ACFT. WE MUST HAVE BOTH PULLED UP AT ONCE. INITIAL CLB WAS CRISP BUT NOT VIOLENT. I THINK COPLT'S REACTION WAS NOT THAT UNUSUAL IN SUPER AUTO TYPE AIRPLANES. GPWS TERRAIN WARNING IS USELESS UNLESS CREW REACTS INSTANTLY. A SURPRISE GPWS ACTIVATION SHOULD BE INCLUDED IN SIMULATOR TRNING WHEN CREW IS IN AUTOFLT MODE. I DON'T THINK IT'S REASONABLE TO EXPECT INSTANT TRANSITION TO MANUAL CLB UNLESS IT IS PRACTICED; ESPECIALLY IN THE NEWER PLANES WHERE AUTOFLT IS EMPHASIZED. I ASKED COMPANY TO INVESTIGATE THE ACTUAL TERRAIN AT THE POINT OF OUR GPWS WARNING. I KNOW YOU WOULD LIKE THE ALTIMETER SETTING; BUT I TURNED IN PAPERWORK AND FORGOT IT. IF I GET FURTHER INFO THAT WOULD INTEREST YOU (ACTUAL TERRAIN CONFLICT); I WILL SEND ANOTHER RPT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THIS HAS HAPPENED BEFORE IN THIS LOCATION. A FOREIGN CARRIER HAS CONDUCTED EXTENSIVE RESEARCH. THERE IS A 5637' HILL IN THE AREA THAT SHOWS ON THE DEP CHART; BUT IT IS NOT DEPICTED ON THE APCH CHART. THE CHART PUBLISHER HAS BEEN CONTACTED AND THEY SAID THEY WOULD INCLUDE THIS HILL ON FURTHER APCH CHARTS. RPTR WAS PARTICULARLY DISTURBED BY THE FACT THAT HIS SKILLED AND COMPETENT F/O FROZE IN THE MACHINE MODE AND TRIED TO COMPLY WITH THE GPWS INSTRUCTIONS WITH THE AUTOPLT CTLS RATHER THAN EXECUTING AN IMMEDIATE PULLUP MANUALLY.