CSOM_CopyFile.js

function copyFile(targetSiteUrl, contextId, targetFileName, targetList) {
	//get current search result item
	var currentItem = window.ctxData[contextId];
	
	// Create a request executor.
	var sourceExecutor = new SP.RequestExecutor(currentItem.SPSiteUrl);
	var targetExecutor = new SP.RequestExecutor(targetSiteUrl);
	
	// Get the absolute server url.
	var serverUrlRegex = new RegExp(/http(s?):\/\/([\w]+\.){1}([\w]+\.?)+/);
	var serverUrl = serverUrlRegex.exec(currentItem.SPSiteUrl)[0];
	
	// Get the source file url.
	var fileUrl = currentItem.Path.substr(serverUrl.length, currentItem.Path.length - serverUrl.length);
	
	// Get the target folder url.
	var folderUrl = targetSiteUrl.substr(serverUrl.length, targetSiteUrl.length - serverUrl.length) + "/" + targetList;
		
	// Get form digest of target site collection
	$.ajax({
        url: targetSiteUrl + "/_api/contextinfo",
        type: "POST",
        headers: {
            "Accept": "application/json;odata=verbose"
        },
        success: function (data) {
            var digest = data.d.GetContextWebInformation.FormDigestValue;
            
            // Build executor action to retrieve the file data.
			var getFileAction = {
			    url: currentItem.SPSiteUrl + "/_api/web/GetFileByServerRelativeUrl('" + fileUrl + "')/$value",
			    method: "GET",
			    binaryStringResponseBody: true,
			    success: function (getFileData) {
			    	// Get the binary data.
			    	var result = data.body;
			    	
			    	// Build executor action to copy the file data to the new location.
			    	var copyFileAction = {
					    url: targetSiteUrl + "/_api/web/GetFolderByServerRelativeUrl('" + folderUrl + "')/Files/Add(url='" + targetFileName + "." + currentItem.FileExtension + "', overwrite=true)",
					    method: "POST",
					    headers: {
					        "Accept": "application/json; odata=verbose",
					        "X-RequestDigest": digest
					    },
					    contentType: "application/json;odata=verbose",
					    binaryStringRequestBody: true,
					    body: getFileData.body,
					    success: function(copyFileData) {
					        //show your 'file copied successfully' message
					    },
					    error: function(ex) {
					    	//show your 'failed' message
					    }
					};
					
					targetExecutor.executeAsync(copyFileAction);
			    },
			    error: function(ex) {
			    	//fail
				}
			};
			sourceExecutor.executeAsync(getFileAction);
        },
        error: function(ex) {
			//fail
		}
	});
}