Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a73a5b34cf97e73…

MALICIOUS

PDF

12.3 KB Created: 2009-10-31 19:49:86 Authoring application: PDF Library 1.7.4 (via PDF Library 5.10.1)
MD5: f6729c8e8c639c68284e40efa57c901e SHA-1: bea36efb23b3ad71496609c678a9a0f953fd5f7a SHA-256: 4a73a5b34cf97e73dcd6083a8338a2ea3b16da015d9f45eb841a70e92bfc601a
338 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

This PDF file exploits multiple Adobe Reader vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, through embedded JavaScript. The heuristics indicate that the JavaScript is obfuscated and likely decodes a second-stage payload. ClamAV detections further confirm its malicious nature, identifying it as Pdf.Exploit.Agent-2440 and Js.Exploit.Shellcode-18.

Heuristics 9

  • 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.Exploit.Agent-2440 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-2440
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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_obj0007_000.js
9e90a13fc3223481706de610f9dc246d820a24f70514cb9da8f58e07ffede077		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 37124 bytes
legacy_pdfkit_stage_000.js
ac3c3bda28f097d03d91950c7c628ad4f595b5c9a912b5fa5cd1ab181f896e6b		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x268 9868 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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