Malicious PDF — malware analysis report

Static analysis result for SHA-256 149c237e6f8983a6…

MALICIOUS

PDF

417.7 KB Created: 2007-02-25 14:30:32 +08:00
MD5: ebf5f21a1edda53ba75e539773c2be28 SHA-1: 859a8d3f00d88e6c1a52e3b1c45514d61f3ffc4b SHA-256: 149c237e6f8983a6b7520112bc27d8c6827a5e07f79f5b600bf1fc463919d091
340 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript that utilizes the unescape function and targets the Collab.collectEmailInfo method, indicating exploitation of CVE-2007-5659. The embedded JavaScript stream, named 'javascript_obj0077_000.js', is heavily obfuscated but its structure and the heuristic firings strongly suggest it is designed to download and execute a secondary payload. The ClamAV detection of 'Win.Dropper.Agent-34536' further supports its malicious nature as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 11

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Win.Dropper.Agent-34536 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Agent-34536
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0077_000.js
d0e67dd7ea2173fb71cb9c78e2529cae771ba5fd825e748382551ada286e5d7c		 pdf-javascript-stream PDF /JS object 77 at offset 0x67445 3677 bytes
Detection
ClamAV: Win.Dropper.Agent-34536
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).

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