Emacs打开pdf无法正常显示文档

wAterLoo

用Emacs打开某个pdf后显示如下

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1 0 obj

<</Type/Catalog/Pages 2 0 R/Lang(zh-CN) /StructTreeRoot 1207 0 R/Outlines 1046 0 R/MarkInfo<</Marked true>>>>

endobj

2 0 obj

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