PDF malware analysis — malicious · d993f9acb454b2ee

MALICIOUS

PDF

118.5 KB

MD5: fefca22fc54b2506d7a158bc04890f8b SHA-1: 66db48e492ade93a8c6442e56af956479ff2fa78 SHA-256: d993f9acb454b2eef2b215adfb7236ecdeddbc9a114cd5c101f3eb6476cdc061

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode, which are commonly used for obfuscation and payload delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary heuristic 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' suggests a stager designed to execute further malicious code, likely downloading a second-stage payload. The presence of a large, obfuscated JavaScript stream further supports this. The ClamAV detection name 'Pdf.Exploit.Agent-36086' is included as a specific IOC.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `9a54e5d19e19c4e79a063c870dc2dc397cc1b59c64d6115f736c5d6b61be90cd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627410 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).

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