I tried
gswin32c -sDEVICE=jpeg -sOutputFile=foo.jpg foo.pdf
but I get the ff. output from Ghostscript on the page where the Chinese font is used.
Substituting CID font resource/Adobe-CNS1 for /·s²Ó©úÅé.
Error: /undefinedresource in --findresource--
Operand stack:
--dict:4/4(L)-- F3 12.96 --dict:6/6(L)-- --dict:6/6(L)-- ·s²Ó©úÅé --dict:9/12(ro)(G)-- --nostringval-- --dict:8/8(L)-- --dict:8/8(L)-- Adobe-CNS1 CIDFont Adobe-CNS1
Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1 3 %oparray_pop 1 3 %oparray_pop 1 3 %oparray_pop --nostringval-- --nostringval-- 3 1 33 --nostringval-- %for_pos_int_continue --nostringval-- --nostringval-- --nostringval-- --nostringval-- %array_continue --nostringval-- false 1 %stopped_push --nostringval-- %loop_continue --nostringval-- --nostringval-- --nostringval-- --nostringval-- --nostringval-- --nostringval-- %array_continue --nostringval-- --nostringval-- --nostringval-- --nostringval-- --nostringval-- %loop_continue --nostringval-- 12 9 %oparray_pop --nostringval-- --nostringval-- --nostringval--
Dictionary stack:
--dict:1122/1686(ro)(G)-- --dict:2/20(G)-- --dict:75/200(L)-- --dict:75/200(L)-- --dict:105/127(ro)(G)-- --dict:253/347(ro)(G)-- --dict:21/24(L)-- --dict:4/6(L)-- --dict:26/31(L)-- --dict:20/26(ro)(G)--
Current allocation mode is local
Last OS error: No such file or directory
GPL Ghostscript 8.54: Unrecoverable error, exit code 1
It's obvious that Ghostscript's encoding is non-Unicode because it got garbage (/·s²Ó©úÅé) when it read the font name which is in Chinese. Here is a screen shot of the Chinese fonts used as listed by Adobe Reader 9.