Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a60cd44c78c216…

MALICIOUS

PDF

4.7 KB Created: 2010-04-14 17:44:20 Authoring application: Jabaozona (via Nmoxe qjojegopatovi)
MD5: 39915d4b2a953c84b7112407e8a69c0c SHA-1: 72762a6ac12088d6f6c3b1fbdcb679810d11629b SHA-256: 91a60cd44c78c216bc45b6c5d64ea54e59a80f1aafd9003cc3563f5f021925e9
358 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is XOR-decoded and executed via the 'OpenAction' trigger. Multiple critical heuristics indicate exploitation of CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, all related to JavaScript execution within PDFs. The ClamAV detection 'Pdf.Dropper.Agent-7282994-0' further confirms its malicious nature. The script's primary function appears to be downloading and executing a second-stage payload, as indicated by the dropper classification.

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)
  • 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. (identified after JavaScript deobfuscation)
  • 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. (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)
  • ClamAV: Pdf.Dropper.Agent-7282994-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7282994-0
  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction — code runs automatically when opened
  • 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
f9674c703022825398d2943188a340389925d402ee011856e145f0526ce3ba7d		 pdf-javascript-stream PDF /JS object 11 at offset 0xCA4 1420 bytes
page_word_xor_stage_000.js
e5b6d861b4282f5ed48fd6f65aa45f57d7f148a5225e135413c6d6d27ec1780f		 deobfuscated-js page-word XOR decoded JavaScript (decompressed, key=0x91) at offset 0x1F5 3220 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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