PDF malware analysis — malicious · f3362453879d5bc6

MALICIOUS

PDF

3.8 KB

MD5: a1f4c842e120fb9e28925eac87ca5471 SHA-1: fc75e858cddbb287db6f2e0ac1efd212d416e6c5 SHA-256: f3362453879d5bc6f582577d465d1038b541bf39599f2b3c9cfbe71d39b537c2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The embedded JavaScript streams, particularly javascript_obj111712_001.js, likely contain code designed to download and execute a second-stage payload. The use of eval() and String.fromCharCode() suggests attempts to obscure the malicious functionality.

Heuristics 5

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_obj111711_000.js` `b816e0b0131ac66db0a5ace3716011f81978bad689e0bba37974a5f632e6236c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	370 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `702742641d8bf99ef6576b1094fe06217976961757d5df29cdc1eb269c0f9ccc`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x246	5212 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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