/usr/share/themes/Numix/openbox-3/iconify.xbm is in numix-gtk-theme 2.1.2-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #define iconify_width 8
#define iconify_height 8
static unsigned char iconify_bits[] = {
0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00 };
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