PDF malware analysis — malicious · 45fe4006a88f016f

MALICIOUS

PDF

5.2 KB

MD5: 383f14b99b65e24116335aa43bd2d323 SHA-1: 966dbb1242f1257c995b01ecf7fa0d72beba500c SHA-256: 45fe4006a88f016f129e864e286da476ff92da0a91306da89d72320f7cdc35b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicative of obfuscation. The critical CVE-2008-2992 heuristic firing confirms the presence of a JavaScript layer designed to exploit Adobe Reader. This layer decodes and executes a further stage, likely a second-stage payload, leveraging the identified vulnerability. No specific family could be identified, but the attack pattern is consistent with exploit-based PDF delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `fc2de577e6b8b0687453c736d321bc81de06942365663f830dc905ccd13d036f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	9200 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`custom_b64_stage_000.js` `8bca93f8f537ef31399b3e51fb958e2dbb0a622b25d851f5678b57c2d092725c`	deobfuscated-js	custom Base64 decoded JavaScript layer 3 (PDF /JS object 13) at offset 0xD97	2108 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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