PDF malware analysis — malicious · e4c8456559e7ea40

MALICIOUS

PDF

4.3 KB

MD5: 9efaa8bf9e301c1887cba3f2e6df5885 SHA-1: 8365b1b0e98d9f791254d607e895f6fcd2f789b8 SHA-256: e4c8456559e7ea408be3be0b88a2809f483015f8fd6c70d48782557c015cc8fa

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicative of obfuscation. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known PDF vulnerability using 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 nature of the exploit.

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_obj0005_000.js` `3ef24a2c10e520e3866cb6bed429397369616088525f80b663f48f24d784de92`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22346 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` `16a3d9f737317998f362b69632b7ab8a635d24f694c18cb7a303c9e4e7b4e2c3`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6574 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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