Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1973fa49cfa6b57…

MALICIOUS

PDF

4.9 KB Created: 2009-08-26 19:47:55 Authoring application: Eblasha 7.5.7.1 (via PDF Library 7.6.8.5)
MD5: 80f20af63314be2e8c79d8ca99eeb713 SHA-1: 1ee71c3be639930701b17ff2e2adb473645fd609 SHA-256: d1973fa49cfa6b573a3fb8d3e1e49f658c2436cf5a4fa47f287c0d0945c584c2
326 Risk Score

Malware Insights

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

This PDF file is malicious, as indicated by ClamAV detections (Pdf.Dropper.Agent-7685836-0) and multiple critical heuristic firings related to known PDF exploits (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). These exploits target the PDF viewer's JavaScript engine. The embedded JavaScript, specifically the deobfuscated 'numeric_charcode_stage_000.js', is designed to execute shellcode, likely downloading and running a further payload. The extracted artifact also triggered ClamAV with '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.Dropper.Agent-7685836-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7685836-0
  • 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.
  • 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.
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • 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_obj0013_000.js
8435556ac3f950376ca3003c4ffa78449b48e3b4bb5536d7876840f836868afd		 pdf-javascript-stream PDF /JS object 13 at offset 0x37C 27049 bytes
numeric_charcode_stage_000.js
3db5f0974ea61fc9e723bd8356e7ab387daf2ce978d8fb8e4c0f1afd3cbf1ad7		 deobfuscated-js numeric char-code string decoded JavaScript at offset 0x3C9 8286 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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