Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f1cf0d8e738ae1…

MALICIOUS

PDF

45.8 KB
MD5: dee6d2d7b50a5bf4edf251211ea125bd SHA-1: 996ad3d64bb9d3816530120843b1442d5619c1e2 SHA-256: 12f1cf0d8e738ae10d9b15eeda7aa6ff49e28d592bf68e2b965fec5b4d88f04a
170 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits CVE-2009-0927 using the Collab.getIcon method. This JavaScript is obfuscated and decodes further layers, ultimately leading to the download of a second-stage payload from the URL http://dresg.ru/vnd32gMZd4UUY4LmGTfXFF62anCA1eJl?p=1&x=1000&s=oldpdf. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dresg.ru/vnd32gMZd4UUY4LmGTfXFF62anCA1eJl?p=1&x=1000&s=oldpdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
7d1c329ec47b806e4a7c949e7d37ce68c1839df7a37e5a483c3b5308e5abef29		 pdf-javascript-stream PDF /JS object 8 at offset 0x1D3 9215 bytes
custom_b64_stage_000.js
f5828cadcd180cee6fe5f4b0e51ff4d6d20a22f5434cfaaa522bedfbfcb53600		 deobfuscated-js custom Base64 decoded JavaScript layer 2 (PDF /JS object 8) at offset 0x8A7 1517 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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