Status Code : 400 "code": "CORRUPT_DOCUMENT", "message": "The input file appears to be corrupted

Hello,

  I am trying to use Adobe API for PDF processing, but I receive an error: 

{
"error": {
"code": "CORRUPT_DOCUMENT",
"message": "The input file appears to be corrupted and cannot be processed.; requestId=09b7def5-1615-4584-9551-d925e7e12b42"
}
}

 My request body is:
  
{
"$content-type": "multipart/form-data",
"$multipart": [
{
"headers": {
"Content-Disposition": "form-data; name=\"inputFileName\""
},
"body": "OoPdfFormExample.pdf"
},
{
"headers": {
"Content-Disposition": "form-data; name=\"intent\""
},
"body": "PDF_TO_EXCEL"
},
{
"headers": {
"Content-Disposition": "form-data; name=\"targetFormat\""
},
"body": "XLSX"
},
{
"headers": {
"Content-Disposition": "form-data; name=\"InputFile0\""
},
"body": "base64Content"
}
]
}
  
  If I decode the base64Content, I can regenerate my PDF file back, so I don't think there is an issue on the file side.

  I also tried with other sample files, but everytime I have same error code in response.

Can I know the root cause of this issue ?