PDF malware analysis — malicious · bff7dda599f8cd5b

MALICIOUS

PDF

5.4 KB Created: 9404-46-25 19:72:77 -11:08 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)

MD5: e8953c9a87967497989058256f4f7815 SHA-1: 15ebd097872d2265e360a60fa15d5da9eb9c1912 SHA-256: bff7dda599f8cd5bea56407d75e7ab75ef7ef248a378af454e32aa4bf896901c

188 Risk Score

Malware Insights

The PDF file contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()`. Critical heuristics indicate the presence of a CVE-2008-2992 exploit targeting Adobe Reader, which decodes and executes a Base64-encoded payload. This payload is likely responsible for the malicious verdict.

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. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-35551 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35551
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.

Filename	Kind	Source	Size
`javascript_obj0028_000.js` `b59239c3eae5f515e85af40fe7056ddaa26aa3fb07fbe1e01c5d8bb8d01db248`	pdf-javascript-stream	PDF /JS object 28 at offset 0x512	3531 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).
`custom_b64_stage_000.js` `036fc748768fd3ebd10d934ea0089cbfb9a0cc44ba1139dcebc8a2c4ab8b8642`	deobfuscated-js	custom Base64 decoded JavaScript layer 1 (PDF /JS object 28) at offset 0x878	1987 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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