PDF malware analysis — malicious · 472e4d6ceae6bf39

MALICIOUS

PDF

2.3 KB

MD5: d8beacb613dad7e2eb9f269aecbced49 SHA-1: 2abf3e71e8b08b690c5a69cb77937ab9f312089a SHA-256: 472e4d6ceae6bf39117bc98a146267cb48c7ebcccf7efe8f3827647ef2765be0

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript T1204.002 Malicious Link: Malicious File

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript stream utilizes eval() and unescape() functions, common for obfuscation and code execution, likely to download and execute a second-stage payload. The presence of deobfuscated JavaScript files further supports this.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36082 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36082
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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` `772da696bdb365f3f1eb4ea6af881baad391be62f3591b19f2f9827fcc4c9b53`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7ED	479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `efbba61fc7c72d263e4109680cabe3435df0edfda69869e219ae6486e3d2736b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2852 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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