PDF malware analysis — malicious · 16f1a39652c703a9

MALICIOUS

PDF

4.3 KB

MD5: 0706935177a1bb0a599ca88237019fbd SHA-1: 8a493df1735800d53b2fee328cfd2d8506a1dad9 SHA-256: 16f1a39652c703a931664ea45a889d1d789bf52bc221bc63a86429cdd2a17290

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() for execution. This script is designed to download and execute a secondary payload, indicated by the PDF JavaScript exploit cluster heuristic and ML classification. The script's obfuscation and use of eval() suggest malicious intent, likely to compromise the user's system.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj1568_000.js` `03a51e2d819d6170874b2cd64501cce5d6210cdbbab02186c0e2c2adc8385da4`	pdf-javascript-stream	PDF /JS object 1568 at offset 0x138	8311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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