PDF malware analysis — malicious · ef35fed61fc1453f

MALICIOUS

PDF

15.7 KB

MD5: e100fa65e7ddcd24c2a0f6be5fe88d88 SHA-1: 194cf2ff6477eeae2ff94e96890cef357d272aed SHA-256: ef35fed61fc1453fb15ce32803c6d247c9a489890bb507f2dc2e85d741330481

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is highly obfuscated but the presence of eval() and fromCharCode calls, along with ML classification and ClamAV detection as 'Pdf.Exploit.Agent-36086', strongly indicates it's designed to exploit a vulnerability and download a secondary payload. The specific exploit and payload are not discernible from the provided evidence.

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` `60ca66042b66a37712bedbfb7e80584e92a3226375a0598582fa489b6488a262`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425354 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_off00003d31.bin` `c42d99e3503d5b763c211c8abda334569f024c0ff5719c6057e3bcd879740302`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D31	200 bytes

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