Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d05bdfc9d102f6d…

MALICIOUS

PDF

12.1 KB Created: 2009-11-26 19:41:05 Authoring application: PDF Library 2.6.9 (via PDF Library 8.5.10)
MD5: 2d95ece7c1e0fcf5d1faf6a37329d586 SHA-1: b9b003083870d22c5576ab15ced01e1717a44465 SHA-256: 1d05bdfc9d102f6dd84839818a10ae8ce376a5b2c547395ed34ba9c3bd7a8f01
278 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that leverages multiple critical vulnerabilities in Adobe Acrobat (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). Static analysis indicates that this JavaScript is obfuscated and likely responsible for downloading and executing a second-stage payload, as evidenced by the ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. The attack pattern is consistent with exploit kit delivery mechanisms.

Heuristics 8

  • 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 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
573ba8b2394df41f4ee0ec903e3f8e179dace3f381e0959e1e8019d837df55d3		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 37718 bytes
legacy_pdfkit_stage_000.js
4a8f37634870d586085b84162ad737f100b268fab3e5d423cce7bd42e4158570		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x268 9874 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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