Malicious PDF — malware analysis report

Static analysis result for SHA-256 a690ee6e26975162…

MALICIOUS

PDF

9.2 KB Created: 2010-06-17 13:34:45 Authoring application: Meramafexaue (via fbc2cLerinolatarhe)
MD5: cb0077063fc409b75fdf5ba0575ce8d8 SHA-1: 26ab5d24dc74d68cb6ec858c38ae8ab23afe583d SHA-256: a690ee6e26975162640174e4b67cff98a399bcf9c52617de4461a9e3fce52eff
298 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1059.007 JavaScript

The PDF file contains multiple critical heuristic firings indicating the exploitation of several CVEs (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) via XOR-decoded JavaScript. This JavaScript is embedded within the document and triggered by an OpenAction. The deobfuscated JavaScript stream suggests it is designed to download and execute a second-stage payload. The document body is heavily obfuscated and does not provide clear textual lures.

Heuristics 8

  • 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)
  • 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_obj0015_000.js
30ab7e5d2093f6a8d91125ab8963eb699aef7bc8b2433b9c0a5bc2d83f8bb7b7		 pdf-javascript-stream PDF /JS object 15 at offset 0x170B 3966 bytes
page_word_xor_stage_000.js
8791caee3d32792d41fa0aa4fd3c6623f622ea4e3963c5b4d710e61f3a0bc69e		 deobfuscated-js page-word XOR decoded JavaScript (decompressed, key=0x88) at offset 0x413 3326 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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