Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcf2167ca4c8ebd…

MALICIOUS

PDF

69.8 KB
MD5: 4bf9ebb30db4abedb5aab95c39920b6a SHA-1: 5fd8bb8b80562441b41d64d3c40302d010ee29ed SHA-256: 9dcf2167ca4c8ebde358e202d0c203f2f56bee12d357c3f3f67179273a232752
318 Risk Score

Malware Insights

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

This 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. The JavaScript is designed to be evaluated by the PDF launcher, concatenating parts of the document's metadata to form executable code. ClamAV detections on both the original file and an extracted JavaScript artifact (legacy_pdfkit_stage_000.js) as 'Win.Trojan.Agent-36170' and 'Js.Exploit.Shellcode-18' further confirm its malicious nature. The script's intent is to download and execute a second-stage payload, as indicated by the 'Js.Exploit.Shellcode-18' signature.

Heuristics 8

  • 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: Win.Trojan.Agent-36170 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36170
  • 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
9a09617b557573d164e10f5b6739773c959c837cb3ff78be961a0a660b9aa2e1		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 1667 bytes
Detection
ClamAV: Win.Trojan.Agent-36170
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
b3946b2ddc63088c6f3dd2475defc6cbc67da06b3edc138ef80f0c2c1cfe81dc		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x89E 4596 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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