PDF malware analysis — malicious · 4c871dfacdc4a509

MALICIOUS

PDF

2.7 KB

MD5: 0643f673a0d7d2533f3cad85c9331cb5 SHA-1: a6d72c812a5f07a747be24a3615c7d78edfa86ca SHA-256: 4c871dfacdc4a50915e1f956b1acc8ff517ae10d64b2dffe3bb800a346b7267d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of a high-severity PDF_EVAL heuristic indicates the script likely uses eval() for obfuscation or dynamic code execution. The ML classifier strongly suggests malicious intent. The embedded JavaScript, specifically javascript_obj111712_001.js, is the primary mechanism for delivering the malicious payload, likely downloading and executing a second-stage artifact.

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_obj111711_000.js` `6c33861f87a88c43cd59304390243aab3f3087065ac5bbff22237ddf3f506d4e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2538 bytes
`javascript_obj111712_001.js` `3865abdcfd58de36706d158c6f13ad0452bfd94735e5044f6bd06c068d425271`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x8CA	539 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.