fdf文件内容
2 0 obj
<<
/C [1 1 0]
/Contents (ţ˙g\t^šh)
/CreationDate (D:20220328105144+08'00')
/F 4
/M (D:20220328105144+08'00')
/NM (27125bc7-32b2-44ad-92e6e93235463059)
/Page 3
/QuadPoints [305.149994 128.122116 345.762207 128.122116 305.149994 117.349403 345.762207 117.349403]
/Rect [302.918884 117.349403 347.993286 128.122116]
/Subj (ţ˙ŘNŽ)
/Subtype /Highlight
/T ()
/Type /Annot
>>
endobj
/QuadPoints x1 y1 x2 y2 x3 y3 x4 y4
左上角，右上角，左下角，右下角（跟文档说的不一样）
https://stackoverflow.com/questions/9855814/pdf-spec-vs-acrobat-creation-quadpoints
/Rect lower-left-x lower-left-y upper-right-x upper-right-y
左上角,右上角
