and run file / pdfinfo – verify it’s a 18‑page PDF.
| Tool | Command used | |------|--------------| | file | file 18pages.pdf | | pdfinfo | pdfinfo 18pages.pdf | | pdf-parser (by Didier Stevens) | pdf-parser -dump 18pages.pdf | | zcat / gunzip | zcat obj28.bin | | ascii85decode (Python snippet) | python -c "import sys,base64; sys.stdout.buffer.write(base64.a85decode(sys.stdin.buffer.read()))" | | strings | strings -n 6 obj37.bin | | hexdump | hexdump -C | 18 Pages Hdhub4u
When a user types "18 Pages Hdhub4u," they are looking for a specific service. Hdhub4u is one of the myriad torrent and piracy websites that operate on the fringes of the internet. These sites are notorious for leaking copyrighted content—ranging from Bollywood and Hollywood films to South Indian dubbed movies—often within hours of their theatrical release or digital premiere. and run file / pdfinfo – verify it’s a 18‑page PDF
| Obj # | Type | Size | Description | |------|--------|------|-------------| | 5 | stream | 832 | /Length 832 /Filter /FlateDecode – looks like a normal content stream | | 12 | stream | 56 | /Length 56 /Filter /FlateDecode – stream, empty page | | 28 | stream | 342 | /Length 342 /Filter /FlateDecode – contains a lot of zero bytes | | 37 | stream | 1024| /Length 1024 /Filter /ASCII85Decode – ASCII85‑encoded data | | 44 | metadata| 124| /Producer (pdfTeX‑1.40.21) – standard | | 61 | stream | 512 | /Length 512 /Filter /FlateDecode – starts with “%PDF‑1.4” inside | 18 Pages Hdhub4u
Thus the final flag for the challenge is:
from the tail of the decompressed Object 28.