PDF malware analysis — malicious · 85437b8365186ec8

MALICIOUS

PDF

118.6 KB

MD5: f001699ae91b80c1f6d4e6416f5d5d48 SHA-1: e9a0652664de5abcaf799d7989268597ee79ead1 SHA-256: 85437b8365186ec8e71d7a66a8b7e933ce58b692a4bf8cf8c04a7fb7d7f14f74

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, including a large comment-padded eval stager and multiple calls to eval() and String.fromCharCode(). This strongly suggests the execution of malicious code. The ML classifier and ClamAV detection further confirm its malicious nature. The primary attack vector appears to be exploiting PDF vulnerabilities to run arbitrary JavaScript, likely for downloading and executing further malicious content.

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` `8d388fbdae3b6fe8d43591eef41e130a073c356ea5076217954e7e1714c44299`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	628152 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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