PDF malware analysis — malicious · 003c356cb50608e6

MALICIOUS

PDF

2.7 KB

MD5: a340d8673faa7899afac8dca8563ce17 SHA-1: 79825ffc11aa19828b87ce227d99390a68729a8a SHA-256: 003c356cb50608e6cd086c6b051eb016a361676c6cabc74a240a75ad603e99b5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode(), indicating obfuscated code execution. The critical PDF_JS_EXPLOIT_CLUSTER heuristic firing confirms this is a known exploit pattern. The embedded JavaScript streams, particularly javascript_obj111712_001.js, are heavily obfuscated but likely intended to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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` `d963d36e489569f45b00260de2074cf28d8745db50b0786203a6bc00be0af008`	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` `8e9e2f38a2d03d1f81005fdbf831ea1e86d25577ec1f95c7cf3f535fbdad389e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x246	2951 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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