PDF malware analysis — malicious · dfc1c022b4805681

MALICIOUS

PDF

118.5 KB

MD5: de315befb42e8a01632a3388acafac13 SHA-1: 29e007e932c557df63a45ec1781b81739eff4050 SHA-256: dfc1c022b4805681db8abee921c5481ade8db3525eeccb5f1ce045d39364f158

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution and obfuscation, including `PDF_EVAL` and `PDF_JS_LARGE_COMMENT_PADDED_EVAL`. The presence of large, deobfuscated JavaScript streams further indicates malicious intent. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit delivery mechanism. The primary attack pattern involves leveraging embedded JavaScript to execute arbitrary code, likely to download and run additional malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `8a57bc2928c787350881049e406ce79daa8f3bb7be0cc8be33bd1b95d83405db`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626978 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `95661f4b03bad3b36104e3c25f85366188a15313b19cfd296b5084396d09d017`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 644 long base64-like blob(s).

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