I'm not sure about ColdFusion, but try adding the string "?blob=base64"
to the URL for the web service call (works in Java and .Net).The
LiveCycle web services can accept binary data as base64, MIME and DIME
encoding as well as passing a URL to the file (rather than the file
itself). You specify the type you want by adding the blob parameter onto
the web service target URL.You should then be able to send the data
using the BLOB.setBinaryData() and get it out using the
BLOB.getBinaryData() method...