Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d590bc9e95ea88…

MALICIOUS

PDF

4.7 KB Created: 2010-04-30 06:08:55 Authoring application: Liqejocomiheka
MD5: efea210f64f528092fcd4f2e4b76df6c SHA-1: 48e944fb57f46d205ec1cb350ab06d00ec456423 SHA-256: 99d590bc9e95ea88969c74088811369ba1311dcdc7ccbacc14f08c7d75bb756c
300 Risk Score

Malware Insights

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

The PDF file contains multiple critical heuristic firings indicating the exploitation of several CVEs (2009-4324, 2009-0927, 2007-5659, 2008-2992) through XOR-decoded JavaScript. This JavaScript is embedded within the document and triggered by the OpenAction, suggesting an automated execution upon opening. The primary intent appears to be the download and execution of a secondary payload, as indicated by the deobfuscated JavaScript found in 'page_word_xor_stage_000.js'.

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_obj0011_000.js
66b487b6058426c3182f61ab640a03646d06823ab497da9c02f6303d3260eb25		 pdf-javascript-stream PDF /JS object 11 at offset 0xD06 935 bytes
page_word_xor_stage_000.js
7a89d65129eb7d085566f7d45f029c2675455097e982d11b80e23a181b7c1079		 deobfuscated-js page-word XOR decoded JavaScript (decompressed, key=0x9B) at offset 0x257 3193 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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