Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df8d803dabb8148…

MALICIOUS

PDF

228.7 KB
MD5: 00dd91f04c283a672f1b0769cdf1a85b SHA-1: 4ff0c83aabb0681262a326513e671b8dd8eeb4ca SHA-256: 3df8d803dabb8148097e5bf3f8c6e2192e1ce6915bc9371f373b1a24dc34d98e
258 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) through functions like Collab.getIcon, Collab.collectEmailInfo, and util.printf. The heuristics indicate that this JavaScript is used to launch further malicious activity, as evidenced by the ClamAV detection of 'Js.Exploit.Shellcode-18' on an extracted artifact. The deobfuscated JavaScript likely attempts 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
b6e3d83ba8e06bbb1cf027101932d70d8f0b070bc32a836a3eb267443fc869ca		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3039 bytes
legacy_pdfkit_stage_000.js
1df53ce9fcc6d273e2023ff55bb60ab7f993748a093578ffef1e6b7c7b31a022		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xDFA 10967 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s).

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