PDF malware analysis — malicious · 480230a120eacd18

MALICIOUS

PDF

15.7 KB

MD5: eb17afecd8c4363a58826941aeca9345 SHA-1: f418c06c1e964e5cc5fc8f167a96cbd199ef877a SHA-256: 480230a120eacd183a778ab7eed9af9e019bd60666bd313caa3b84e01b4eec34

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample was flagged as malicious by multiple high-severity heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36086). The presence of JavaScript, particularly involving eval() calls and a large comment-padded eval stager, indicates an attempt to execute arbitrary code. The ML classifier's high confidence score further supports the malicious nature. The primary attack vector appears to be exploiting PDF vulnerabilities to deliver a 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `fd5ea6d1121b30b75803c99b6257540421606ecb0745df8c0143bdae46873782`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424697 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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