PDF malware analysis — malicious · da22adfb500395ea

MALICIOUS

PDF

118.4 KB

MD5: e344f54e5e7237fe5cdefbcbc4103a9e SHA-1: 482d9691b0ee63b9aee238245d6e51a5bb75d719 SHA-256: da22adfb500395eaf7c8cd26aaad265fa06dd1ab84ccbe9ca3f549f205a3d246

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, flagged by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. A high-severity heuristic 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' indicates a stager designed to obfuscate its actions. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be downloading and executing a secondary payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings.

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` `9b151672ddb2c0925f7980237305022948d52533b17e8883045644c5e41b9bac`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	625913 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_002_off0001d7fa.bin` `92bc1d239e25311f1d10b9f9e81e7dd54d8a996015f863f47e57daebb369acbe`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D7FA	200 bytes

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