Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa231451f7480a16…

MALICIOUS

PDF

325.2 KB
MD5: f88bf685a91a1bfb8a466cdfe79fd829 SHA-1: 1c4ac0ad51dc0ff57c61b1dd8c28aea53a50723d SHA-256: fa231451f7480a16053f78d6d5282b2fadeebd29d33c5ca4cf252f0e53e33cfc
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link or Document: User Execution

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. The deobfuscated JavaScript, identified as legacy_pdfkit_stage_000.js, is flagged as suspicious and likely responsible for downloading and executing a secondary payload, as indicated by the ClamAV detection 'Js.Exploit.Shellcode-18'. The embedded URL heuristic also suggests a delivery mechanism.

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
c83ca339682b18814935790a90a3523d396325b212c82740076d583047cb4bb8		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3766 bytes
legacy_pdfkit_stage_000.js
27fc8af5b552736dba25a5edb9837c30a2339fcfb35e5b267ab0ef980a853f59		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x10D1 10946 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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