Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabcbca110991482…

MALICIOUS

PDF

77.8 KB Created: 2009-07-23 08:47:32 UTC Authoring application: Acrobat Web Capture 6.0
MD5: 03e5c4cc41027abc962770626a46b6e0 SHA-1: 967b4ee8d9248d461000498bea79009e6fde254c SHA-256: dabcbca1109914828dfece62564018404854f6a2070b1d384479161c49a7f2eb
218 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by multiple heuristics, including ML classification and ClamAV detection, indicating it contains an exploit. The embedded JavaScript, specifically the 'generic_stage_recovery_000.js' script, is designed to execute a series of obfuscated commands. The script attempts to leverage the PDF viewer's JavaScript engine to perform actions that are characteristic of exploit delivery, such as preparing for and executing a second-stage payload. The presence of a secondary embedded PDF further suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Exploit.Agent-1654 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-1654
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • 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.
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0036_000.js
b38c4622252f13500dfaf57fa16edba2e887c0d934217971903c7a5203c7d2dc		 pdf-javascript-stream PDF /JS object 36 at offset 0x2A35 1974 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
generic_stage_recovery_000.js
970a7693b96952e79fe62ce796ceb1af6514c626bebe38a76c01f2f1a4633914		 deobfuscated-js generic stage recovery marker-XX-to-%u from JavaScript object 36 at offset 0x2A35 1472 bytes
polyglot_child_pdf_off000107a0.pdf
ee05eb079f51761a4508f41ba865a9dd3368c930652915b74a26a070bfc9d76e		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x107A0 12180 bytes

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