PDF malware analysis — malicious · 266f4013f39fe771

MALICIOUS

PDF

118.6 KB

MD5: d77474e3142027f73fa308b38ad45f5c SHA-1: 4812d2ea47575ba75aa84081447276b6da24eade SHA-256: 266f4013f39fe771f2437ff1db16fcbffee1fde4f37b1e9cae7a29738156a993

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection, indicating it contains malicious content. The presence of JavaScript, specifically a large comment-padded eval stager, strongly suggests it's designed to execute arbitrary code. This type of stager is commonly used to download and run further malicious payloads from remote servers. The ClamAV detection name 'Pdf.Exploit.Agent-36086' further supports the exploit nature of the file.

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` `0cd5b6b08dd88d69438351a294e9fc242dfd2e9ace5b4027886a30a6b9ef360a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627083 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_off0001d8b2.bin` `94be3461de95df857d1d4e592336f4adab6a4d327f5a03a396f9868fe85120e5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8B2	200 bytes

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