PDF files may contain characters that are mapped differently in LiveCycle Designer ES. To deal with this issue, you can use character-mapping rules in the character-mapping table in the ConvertPDF_CharMap.txt file.
LiveCycle Designer ES relies on the character-mapping table to display input PDF symbols correctly in its native character set. The table contains several default entries.
input_char,input_font=LiveCycle Designer ES_char,LiveCycle Designer ES_font
LiveCycle Designer ES_char
LiveCycle Designer ES_font
See also 

Character-mapping table in ConvertPDF_CharMap.txt