Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eae664e29760e67…

MALICIOUS

PDF

159.7 KB
MD5: 613fe6a97d84ccbc5e768dc98cea6e75 SHA-1: e33156672a81fc20f538e5665254ae474c51e245 SHA-256: 2eae664e29760e679dcfe9162eab6e9470914601914045e3d103e3044028ae04
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) in Adobe Reader. The extracted JavaScript, identified as legacy_pdfkit_stage_000.js, is heavily obfuscated but indicates the execution of shellcode. ClamAV detected this as Js.Exploit.Shellcode-18, suggesting the script's primary purpose is to download and execute a malicious 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
b195ff5a60832b17d0a811dea862317c970771029bf370eaaf97d29a786d2021		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2462 bytes
legacy_pdfkit_stage_000.js
c84bb2202f81c968559e0c591b98da8e3d1be0f4496596183c4b2ee169bd7bfe		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xBB9 4452 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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