Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7416b95c4d5274…

MALICIOUS

PDF

72.0 KB Authoring application: PDF-XChange Viewer [Version: 2.0 (Build 40.5) (Nov 10 2008; 18:57:55)]
MD5: f42bf9b8d690c6b5cafc59aa38971aef SHA-1: a9f494c6b458b5b22d28f2d4ad85f5ddabeb91dd SHA-256: ad7416b95c4d5274625edc4606b5e1cd4495f0206ce3c57d6cef3f56aef231e4
258 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 using functions like Collab.getIcon and util.printf. Static triage identified obfuscated JavaScript and a suspicious extracted artifact named 'legacy_pdfkit_stage_000.js', which was detected by ClamAV as 'Js.Exploit.Shellcode-18'. This indicates the script is designed to download and execute a second-stage payload.

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 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
fdb1d17ed9cd82ed5b4cb525c86bf50c9f7a773f64330dc31d79f4d2c50ffe82		 pdf-javascript-stream PDF /JS object 8 at offset 0xCAC 2437 bytes
legacy_pdfkit_stage_000.js
84d3fb0599f8a0beb94029cacf8c59bd5f1abe38723e3c29783c8b3032880f6e		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x16C8 4506 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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