PDF malware analysis — malicious · ec67757e6d7375e0

MALICIOUS

PDF

4.2 KB

MD5: f3718763efaf64594075d594714f91de SHA-1: af9111bee734b990ce5152bec81de7899b78e8be SHA-256: ec67757e6d7375e0ae571a941d2652e1e76883dd81d29f9a0f9b0afe63a8f0bd

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript Execution T1204.002 Malicious File: User Execution: Malicious JavaScript

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008-2992 heuristic firing confirms the use of util.printf to decode and execute JavaScript. This script is designed to download and execute a second-stage payload, as evidenced by the deobfuscated JavaScript stream. The specific exploit used 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)
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` `ea01bb4469f24742ab4509449dd574bb4398f31d58c5405b0fd39adda884d2a7`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21267 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` `3fefa49e5e30bbd109864adea9a1be64a9f3379bce3285018cbc37a0fc3b2782`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6256 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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