Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2f2f6fa72d8af5…

MALICIOUS

PDF

250.1 KB
MD5: 6c6408b80fffce5f7bf8fedf82c3e25b SHA-1: f2b60ef11b0edc5db964f77b4a0b398ff3f88564 SHA-256: 7c2f2f6fa72d8af52ca7789c82bfab8c95a5e567b605aa53cd585cd62293b4bf
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages multiple critical vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These vulnerabilities are exploited through the use of 'Collab.getIcon', 'Collab.collectEmailInfo', and 'util.printf' functions within the JavaScript. The embedded JavaScript stream was deobfuscated and identified as 'legacy_pdfkit_stage_000.js', which ClamAV detected as 'Js.Exploit.Shellcode-18'. This indicates the script is designed to download and execute a malicious 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
c78c667eee55f3e5f0bba07577d6088adc60472c4eaf7bc6d1aef6c1f8ed485b		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3415 bytes
legacy_pdfkit_stage_000.js
3d94d8e16e8f85259910765a55af3cac06d3a40e42b1cc952725c705654112dc		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xF72 8394 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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