PDF malware analysis — malicious · b4414dad26253ef4

MALICIOUS

PDF

7.4 KB

MD5: 938d8368c8f851b83952cd2ae157e3d7 SHA-1: 76b99f35a6b290fa792661319ecd8e9fafc5c534 SHA-256: b4414dad26253ef43344c347c9b90f9fd32845b79366ece422a64474309e31df

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode() suggests the script is obfuscated and likely intended to download and execute a second-stage payload. The document body is unreadable, providing no further context on the lure.

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_obj0004_000.js` `02afb229aeddd8470da6f38f986eb657a36cda34283a986801387d21a373a447`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	306 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001b8d.js` `5f8ee08f70aa17d84f099468ae3195b484451c6b322d97362ae79275daab7bd9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1B8D	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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