Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143244ea9469e8a…

MALICIOUS

PDF

308.6 KB Created: 2009-12-21 16:55:35 +08:00 Authoring application: Acrobat PDFMaker 7.0ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿcer(Acrobat Distiller 7.0 (Windows) (via Acrobat Distiller 7.0 (Windows))
MD5: f77f83b7c388c46f771ba7a1e419e833 SHA-1: 038943d3d8eede4ba34dbb5005e000b4185cdd4b SHA-256: 8143244ea9469e8a494323b55de8c43a3185a3522c5c7443ba21e1af290df8d2
492 Risk Score

Malware Insights

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

This PDF file contains multiple critical heuristic firings indicating the exploitation of known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) through embedded JavaScript. The JavaScript code, including a recovered exploit stage, is designed to download and execute a secondary payload. The presence of a secondary embedded PDF further suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 13

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • 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. (matched in decompressed stream)
  • 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.
  • 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-13220 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-13220
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0043_000.js
6a4feff50242ca48bccb7b8303874c63d44c492cea43499d20ce94d354dc031d		 pdf-javascript-stream PDF /JS object 43 at offset 0x2430 2172 bytes
javascript_obj0043_001.js
72a7a81874bc825243697fb1380a9dc969da68bf826f90ff5241fdd360dd07a9		 pdf-javascript-stream PDF /JS object 43 at offset 0x2465 6463 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
generic_stage_recovery_000.js
16ae11897d85015a75a4476aa5d780ff0fb25880746f1a6e954a1c4f5329200c		 deobfuscated-js generic stage recovery marker-XX-to-%u from JavaScript object 43 at offset 0x2465 5838 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s).
combined_document_js_000.js
6b274891890bf0d519e3384adb17e8bb7394a4452b3b364e01a340896daea0d1		 deobfuscated-js combined document JavaScript streams at offset 0x2430 8636 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
javascript_obj0043_000_1.js
ca2fd006a36b1a8b13870873fa5709a4707a8a167d66ee7a20c04b335b1fa33e		 pdf-javascript-stream PDF /JS object 43 at offset 0x2430 2116 bytes
polyglot_child_pdf_off000492b1.pdf
9a92832b0e44cdf69122ca7d3818540f162a8455d855283afdd8545ffda376c3		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x492B1 16302 bytes

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