Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40c9c0727ceb649…

MALICIOUS

PDF

6.5 KB Created: 1999-09-30 08:51:33 Authoring application: Microsoft Word (via Acrobat PDFWriter 4.0 for Windows)
MD5: fd637612bee6bdc303ed059115efd66b SHA-1: 2d6cabfcc32e7133e713ac905f523129bbc91f2a SHA-256: a40c9c0727ceb649708dea84205002c64e83b73847fe08526fe690fb7aa54569
238 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes the `unescape()` function and a `util.printf()` call, indicating exploitation of CVE-2008-2992. The embedded URL and ClamAV detection (Win.Trojan.Agent-36168) further support its malicious nature. The script likely attempts to download and execute a second-stage payload.

Heuristics 8

  • 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.
  • ClamAV: Win.Trojan.Agent-36168 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36168
  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.coresecurity.com/content/adobe-reader-buffer-overflow

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0020_000.js
ff2f5d58b5ac7c6025b6110cc9b4bb6746e14e716f96eeb7d681665ef96725b8		 pdf-javascript-stream PDF /JS object 20 at offset 0xB5B 3252 bytes
Detection
ClamAV: Win.Trojan.Agent-36168
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
javascript_obj0020_001.js
606cd4215718e476aac08f000ef882b51ab96116b7bdb1e2df80d08d6bbb2a6a		 pdf-javascript-stream PDF /JS object 20 at offset 0xB5B 94 bytes

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