Malicious PDF — malware analysis report

Static analysis result for SHA-256 cace9d189adc6cd9…

MALICIOUS

PDF

3.4 KB Created: 2010-02-11 07:23:20 Authoring application: zt6750a
MD5: 8e37dd5a30465ef6d69ba4ba55700420 SHA-1: b3e03911a7b0a4f21395e9adeec6c6ac515e5be1 SHA-256: cace9d189adc6cd91ac77ea3b2a8e8481f774c6b8ddd0d9d4fb09ae791f7f108
198 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-0927 and CVE-2007-5659, specifically targeting Adobe Reader's `Collab.getIcon` and `Collab.collectEmailInfo` functions. The heuristic firings indicate that this JavaScript is used to execute arbitrary code, and a ClamAV detection on an extracted artifact (`Js.Exploit.Shellcode-18`) suggests it's a known exploit. The primary goal appears to be downloading and executing a second-stage payload, as indicated by the `legacy_pdfkit_stage_000.js` file.

Heuristics 6

  • 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)
  • 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.
  • 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_obj0028_000.js
e68e04441d66e12c8e3f504a2112780b2b6d04902bf99c22eb454906bca34ff8		 pdf-javascript-stream PDF /JS object 28 at offset 0x88 903 bytes
legacy_pdfkit_stage_000.js
a5ed05998ee6c2b83a185975b507cd6d495d539ae96544639704f90442d3a634		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x451 4930 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 8 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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