cakephp + aws getobject not proper working

I am working on a project which is in cakephp V2.3 with AWS PHP SDK V2.8. which is hosted on AWS ec2 ubuntu machine. I am trying to get the image which is hosted on AWS S3 by following code

        try {
            $resultS3 = $this->Amazon->S3->getObject(array(
                'Bucket' => 'mytest.sample',
                'Key' => 'files/user/image/35/1440319731.png',
            ));
        } catch (S3Exception $e) {
            pr($e); //die;
        }
        header("Content-Type: {$resultS3['ContentType']}");
        echo $resultS3['Body'];

but I am getting following message.

The image “http://ift.tt/1KHOmlP” cannot be displayed because it contains errors.

and the response is following

Guzzle\Service\Resource\Model Object
(
    [structure:protected] => 
    [data:protected] => Array
        (
            [Body] => Guzzle\Http\EntityBody Object
                (
                    [contentEncoding:protected] => 
                    [rewindFunction:protected] => 
                    [stream:protected] => Resource id #20
                    [size:protected] => 
                    [cache:protected] => Array
                        (
                            [wrapper_type] => PHP
                            [stream_type] => TEMP
                            [mode] => w+b
                            [unread_bytes] => 0
                            [seekable] => 1
                            [uri] => php://temp
                            [is_local] => 1
                            [is_readable] => 1
                            [is_writable] => 1
                        )

                    [customData:protected] => Array
                        (
                            [default] => 1
                        )

                )

            [DeleteMarker] => 
            [AcceptRanges] => bytes
            [Expiration] => 
            [Restore] => 
            [LastModified] => Sun, 23 Aug 2015 08:49:22 GMT
            [ContentLength] => 207719
            [ETag] => "a alphanumeric value"
            [MissingMeta] => 
            [VersionId] => 
            [CacheControl] => 
            [ContentDisposition] => 
            [ContentEncoding] => 
            [ContentLanguage] => 
            [ContentRange] => 
            [ContentType] => image/png
            [Expires] => 
            [WebsiteRedirectLocation] => 
            [ServerSideEncryption] => aws:kms
            [SSECustomerAlgorithm] => 
            [SSECustomerKeyMD5] => 
            [SSEKMSKeyId] => arn:aws:kms:ap-southeast----
            [StorageClass] => 
            [RequestCharged] => 
            [ReplicationStatus] => 
            [RequestId] => 367A8A19F55234F9
        )

)

I create a custom component for accessing all features of SDK. with the reference of http://ift.tt/1Jc0cPN.

can anyone tell me where I am doing it wrong.