Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ec245ec5567b30…

MALICIOUS

PDF

135.0 KB
MD5: 353f2ca9d6f693492ace40dceb8d6d95 SHA-1: 62497fab5c60a8203b6a1fd58bd3f4ba1d27c886 SHA-256: f0ec245ec5567b30a16b0f040a742407f5207bb58de8303a0ee3d2de20c7ef3f
258 Risk Score

Malware Insights

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

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded and obfuscated JavaScript. An extracted artifact, 'legacy_pdfkit_stage_000.js', was also flagged by ClamAV as 'Js.Exploit.Shellcode-18'. This suggests the primary function of the PDF is to act as a dropper for malicious JavaScript, likely to download and execute further stages of malware.

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
574202db12130f433c917d48c781eec2ffa89228af827f79bc48ad933ee6793e		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2089 bytes
legacy_pdfkit_stage_000.js
ec1ae9941da3ed7276544a499e9151201c3dd94a12eb9234264f7360a46e9d35		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xA44 9024 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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