PDF malware analysis — malicious · a5a214fa51769ca3

MALICIOUS

PDF

118.4 KB

MD5: d775ebfa4f718a39b37aea4eb5e074aa SHA-1: 762b372c50f1716131dccb9d72721cda8e8be1a6 SHA-256: a5a214fa51769ca313e2d4ccc483eee1e4c313e959771476d57dd71539802b1a

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a high-severity 'Large comment-padded JavaScript eval stager' heuristic firing. This indicates the script is designed to obfuscate and execute malicious code. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves leveraging JavaScript within the PDF to deliver an exploit or payload.

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` `b9a9e2035c94e7a9d14cc4c46c35b0c5e62fee0f43e1a4b4717d27c0b19bbc9a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626757 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).
`stream_001_off0001d64b.bin` `571c8c6b76919dd04414b72a0c70529af71a2ffc0c5cfa11a4b3a27f876202ff`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D64B	300 bytes

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