Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51ac3d186426cae…

MALICIOUS

PDF

70.1 KB
MD5: 6b0e0c6fb5eede1e3ef588d90e7e723a SHA-1: f0dd7a3e9a2297a150ff73e6a8ecff0b4cb4669a SHA-256: e51ac3d186426caec8691a49af9ec4e2acb75f642d0caca1908dd06bb9db8bcd
258 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages multiple critical vulnerabilities including CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). These vulnerabilities are used to execute arbitrary code. An extracted artifact, legacy_pdfkit_stage_000.js, was detected by ClamAV as Js.Exploit.Shellcode-18, indicating it is a malicious JavaScript exploit. The script's purpose is to download and execute a second-stage payload.

Heuristics 7

  • 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.
  • 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_obj0008_000.js
de6501ba1ad7188158ce740da5ff74c3631d6070ed9fa56a18925d8e46b6b991		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 1672 bytes
legacy_pdfkit_stage_000.js
1e627e77b4c1e2776129f8dba8d10275c5d2d19e1f4b822fcb851d8729163c91		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x8A3 4620 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s).

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