PDF malware analysis — malicious · e45f24a1213005a8

MALICIOUS

PDF

4.0 KB

MD5: c8bf2975b05a8750a25d63d21ad3357f SHA-1: ea97c3b94f21ff11c67f031c6f7af0555ec5baae SHA-256: e45f24a1213005a83eab7a562d0e794af838c1ad77bf336965a814ea4609d5b4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008-2992 heuristic firing confirms the presence of an Adobe Reader exploit targeting util.printf, which decodes and executes a layered JavaScript payload. This payload is designed to leverage the exploit to run arbitrary code. No specific family could be identified, but the attack pattern is consistent with exploit-laced documents.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `73a4f7d7a8a8e1db603b93b97769aa6ae90b184145a146ecf2bcc06fb8b8e707`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6277 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `d59c5e5c83eae382c66d8e2abcb97c7b9dd11936c65720101cf125d5ba508913`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3555 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`custom_b64_stage_000.js` `fc128eba2b567665a7b49d3ac26181e852a3c344d044447fe35e12f0f240e86b`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 13) at offset 0x95E	2067 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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