PDF malware analysis — malicious · cf1241fdc6f3718a

MALICIOUS

PDF

4.4 KB

MD5: 4032a770b48e08b2cba5d5c10bd766ab SHA-1: 55cf712ed15a600073f50c046c5a53c88cbb74ec SHA-256: cf1241fdc6f3718af1e6f213f3ff463f1131e598e3916050ee5525a3256dd0be

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF document contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicative of obfuscation. The critical CVE-2008-2992 heuristic confirms the exploitation of this vulnerability via util.printf to decode and execute JavaScript. This script is designed to download and execute a second-stage payload, as suggested by the extracted JavaScript files and the overall malicious verdict. The specific exploit mechanism is CVE-2008-2992.

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` `595404da4eb754086cfc7c39e555e46289a0015c4579c21defff67518655ecd3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23336 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` `73180913a6284382e37e70d2d5e6da032e05fa52e67d384077389e9a74c8116e`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6860 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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