PDF malware analysis — malicious · 3cfec2dd8e71972d

MALICIOUS

PDF

2.8 KB

MD5: ffb1b944b22b792f43c114e86ba5f222 SHA-1: d611ec4e0e46ba5811eb6608edf53f19c9ba7258 SHA-256: 3cfec2dd8e71972de34c00a2847f52ac1bcb9918bdb7a3a1ec5ac0a661ff3c5b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution and obfuscation, including the use of eval() and String.fromCharCode. The ML classifier strongly flagged this as malicious. Two JavaScript streams were extracted, indicating the likely intent is to download and execute a secondary payload. The obfuscation within the scripts prevents a more detailed analysis of their specific actions.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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_obj111611_000.js` `bf714c45455291064d2cb7ee241559707326803097fc78b47f509d8a8ac92758`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `5e4b2e75dfc87afd91175b206b096db0fbee16266d2c171e56fd224586484727`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.