Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1018a9f76c68536…

MALICIOUS

PDF

164.0 KB
MD5: d19cbb49f6956ebb1a90bd4c6a136c99 SHA-1: c991c03fa97135c3328048bd1b5f6e102bf12a70 SHA-256: f1018a9f76c68536ce307f115663341fe30ade46a447ab6f50c330444030ae59
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link or Macro: 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 obfuscated JavaScript, which was further deobfuscated and identified by ClamAV as Js.Exploit.Shellcode-18. The script's primary function appears to be downloading and executing a second-stage payload, indicated by the heuristic firings and the extracted artifact name 'legacy_pdfkit_stage_000.js'.

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
47c11b0048f9702967f9b16866d50a4a29b5b86ebdd022b87a78031da28539bb		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3145 bytes
legacy_pdfkit_stage_000.js
36a5cf8c9c83601c558fb613dd29ea76dcdd21764ba67b9aa32e13ec4fbbad16		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xE64 10928 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.