Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8b4dd2ce0d4ec7…

MALICIOUS

PDF

111.4 KB Created: 2009-07-23 08:47:32 UTC Authoring application: Acrobat Web Capture 6.0
MD5: 9ef0794d27d89470ad95a57e2a58adb7 SHA-1: 8ba552e96b12ca1043dfbc3d62528e88d85a9cd4 SHA-256: 2d8b4dd2ce0d4ec7250a79987d04d984ba8ea0bc6e84349a4fe1ecb21a5a7dee
218 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF file was flagged as malicious by multiple high-severity heuristics, including ML classification and ClamAV detection (Pdf.Dropper.Agent-1828677). It contains embedded JavaScript that is heavily obfuscated but appears to be designed to exploit a vulnerability. The deobfuscated JavaScript contains a large string of hex-encoded data which is likely a payload or further exploit code. The primary function of the script is to execute this payload, which is typical behavior for a PDF dropper.

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.Dropper.Agent-1828677 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1828677
  • 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_off00018de7.pdf
ee05eb079f51761a4508f41ba865a9dd3368c930652915b74a26a070bfc9d76e		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x18DE7 12180 bytes

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