PDF Extract Service API Fails with BAD_PDF_FILE_TYPE

I'm pulling my hair out over this, this is my code to send the file to Adobe servers

module.exports = async (file, uploadURL) => {
  try {
    const myHeaders = new Headers();
    myHeaders.append("Content-Type", "application/pdf");

    const formdata = new FormData();
    formdata.append("file", JSON.stringify(file));
    console.log(file);

    const requestOptions = {
      method: "PUT",
      headers: myHeaders,
      body: formdata,
      redirect: "follow",
    };

    const res = await fetch(uploadURL, requestOptions);
    console.log(res?.statusText);
  } catch (error) {
    console.log(error);
  }
};

and this is what the file looks like when i log it to the console

{
  name: 'Label.pdf',
  data: <Buffer 25 50 44 46 2d 31 2e 36 0a 25 c3 a4 c3 bc c3 b6 c3 9f 0a 32 20 30 20 6f 62 6a 0a 3c 3c 2f 4c 65 6e 67 74 68 20 33 20 30 20 52 2f 46 69 6c 74 65 72 2f ... 39732 more bytes>,
  size: 39782,
  encoding: '7bit',
  tempFilePath: '',
  truncated: false,
  mimetype: 'application/pdf',
  md5: '6272657ca193f14546e27bcfa8226a76',
  mv: [Function: mv]
}

 Any help would be much appreciated