Malicious PDF — malware analysis report

Static analysis result for SHA-256 798f47fd06dc8eaf…

MALICIOUS

PDF

5.3 KB Created: 5318-13-25 49:65:95 -34:09 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: f575fdfc2d4af69972f60aa919279dbd SHA-1: 888902b6eac39f553f8b6dd8bd8c8388c1c3582a SHA-256: 798f47fd06dc8eaffe449dae9d4f05fc1d8b639419ad72197b4ab2dd496d4860
246 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.001 JavaScript

The PDF file contains embedded JavaScript that utilizes the CVE-2008-2992 vulnerability. This exploit is designed to download and execute a second-stage payload. ClamAV signatures confirm the malicious nature of the file, identifying it as Pdf.Exploit.Agent-35551. The JavaScript is heavily obfuscated but appears to be a custom Base64 decoder that unwraps and executes exploit stages.

Heuristics 9

  • 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.Exploit.Agent-35551 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35551
  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0028_000.js
da28397fbd00ebe1bed1f7772b00ae122f380f4ca22161d5101a23a85b957fe9		 pdf-javascript-stream PDF /JS object 28 at offset 0x4E2 3527 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35551
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
custom_b64_stage_000.js
59acd460c63a6ac0e4e281f2c6f096eb17bf3611e6e56f01dd53c375c174ca95		 deobfuscated-js custom Base64 decoded JavaScript layer 1 (PDF /JS object 28) at offset 0x848 1986 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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