Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc9a6df5b7a52df…

MALICIOUS

PDF

12.2 KB Created: 2009-10-31 19:48:72 Authoring application: PDF Library 2.4.1 (via PDF Library 7.2.9)
MD5: 021a8a62b9ebf334fea1c60cd2633cc0 SHA-1: e0dfad1bde9a89fe95ab1d712b3f852a88508de9 SHA-256: 8fc9a6df5b7a52df79ff09ba5fb0bd2368a533402e401e376ffe4efb3c61c1f2
338 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits multiple Adobe Reader vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. Static analysis indicates that this JavaScript is designed to download and execute a second-stage payload, as evidenced by the 'Pdf.Dropper.Agent-7282297-0' ClamAV detection and the 'Js.Exploit.Shellcode-18' signature on an extracted artifact. The deobfuscated JavaScript file 'legacy_pdfkit_stage_000.js' is likely responsible for this malicious action.

Heuristics 9

  • 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: Pdf.Dropper.Agent-7282297-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7282297-0
  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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_obj0007_000.js
6e0feba871eb5ae8f60376c2cd85812f9d48f9265b5e0c4735eae40305506180		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 38126 bytes
legacy_pdfkit_stage_000.js
51a3231b138e3f1763d555d11dc7b0cbc26ed88664ce5704050d6539add1dec7		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x268 10078 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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