PDF malware analysis — malicious · 071ff6a6800ea066

MALICIOUS

PDF

3.9 KB

MD5: 12d3227a9a5b6d009988bb5391346382 SHA-1: 47c78cd9dd5824f37794e8e50040117ebdc91887 SHA-256: 071ff6a6800ea066740dbe5e5c36caa452f385f5ef4db1749546e4042d007561

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains obfuscated JavaScript, including eval() calls and String.fromCharCode, which are indicative of exploit code. The embedded JavaScript streams, particularly 'javascript_obj111612_001.js', are heavily obfuscated but likely contain logic to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it's an exploit delivery mechanism.

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_obj111611_000.js` `b80238aba887bf50a4db57be3c73793fd447ef83bc9e9d2baa8080012103704a`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	259 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `b02301386b9be5c6c1714b9390c2a8b060c06e18b64da6935dee753be1bb08b5`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x269	5545 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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