PDF malware analysis — malicious · 51334ee5d4e47ec1

MALICIOUS

PDF

4.2 KB

MD5: 615052aef51b4287f10539d924e09fd5 SHA-1: 52e5d1b39dedc5c804cf22425ad69345859e7c09 SHA-256: 51334ee5d4e47ec1345367432052c858fa74268ed7a011682fb437f714ed8e1b

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicative of obfuscation. The critical CVE-2008-2992 heuristic confirms exploitation of this vulnerability via util.printf. The embedded JavaScript is designed to decode and execute a second-stage payload, likely for further malicious activity. The obfuscated nature of the script and the reliance on a known exploit suggest a downloader or initial access mechanism.

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)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `dc27e171e374ece2137359b04852a8c821cac523e8b6b4bcb11e72b2c3418d71`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21368 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `6bbe61135a0602c008ad64420c22291552c6b19cf6c5d03a07356972a18d2c6a`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6286 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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