Malicious PDF — malware analysis report

Static analysis result for SHA-256 74766579b8b65889…

MALICIOUS

PDF

7.9 KB Created: 2010-10-05 19:18:00 Authoring application: Pafitisbotticxixoua (via 1d30dJehabactasga)
MD5: de487007e84adbcbcf0d8b9f0cf9a84f SHA-1: fbc97d4f64a3fd173489968b4780c8abe182241c SHA-256: 74766579b8b658895e6bee945fae7254e5a648e5736c47f6c8117edc2759fe3b
408 Risk Score

Malware Insights

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

The PDF file contains obfuscated JavaScript that leverages multiple known vulnerabilities in Adobe Reader, specifically CVE-2008-2992 and CVE-2009-4324. The embedded JavaScript attempts to execute functions like `media.newPlayer` and `util.printf`, which are associated with these exploits. The script also calls `Collab.getIcon`, indicating a dispatcher pattern for exploiting different CVEs. The primary goal appears to be the execution of a second-stage payload, as suggested by the exploit kit detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 9

  • 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. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT
    A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js
1d712bcf04655f0ea3df286010452910c0e6b45f83cc66ee3a790e43e4d30967		 pdf-javascript-stream PDF /JS object 11 at offset 0x136A 3144 bytes
legacy_pdfkit_stage_000.js
18699f9d55ae1f1fd22bc427d0f09ac790fd8fafb1557dc66370fe40318c5f52		 deobfuscated-js getPageWords-XOR Pidief stage normalized at offset 0x0 153 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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