Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dfa768e106a26d…

MALICIOUS

PDF

297.7 KB
MD5: 96e46f2f8125ae2df81f01cf6de2904d SHA-1: 50e840e66ef3f7e808f602d4b2891909733d2d48 SHA-256: f4dfa768e106a26d9a167613bf718e0cd29ca6036a697f2f31a8dc1d1a79acd0
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.001 Malicious Link or False Update T1059.007 JavaScript

The PDF file contains embedded JavaScript that leverages multiple critical vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) related to JavaScript execution within Adobe Reader. The heuristics indicate that the PDF launcher concatenates info fields, extracts characters, and evaluates the result. An extracted artifact was detected by ClamAV as 'Js.Exploit.Shellcode-18', suggesting the JavaScript is designed to download and execute a secondary payload. The obfuscated nature of the JavaScript and the use of known exploits point to a malicious downloader.

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
d1f95da167c15129175873a7ce681f4558a29692a9930fd160a1a4a92ba1abe6		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2462 bytes
legacy_pdfkit_stage_000.js
e637e70d32df388a9f3335487a5a1389da1c12215be19c1f3892440d7b458a01		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xBB9 8376 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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