PDF malware analysis — malicious · 1bc76b56340a984f

MALICIOUS

PDF

15.7 KB

MD5: c9fc7958ef30546021865a8b0ac9a5e9 SHA-1: b7048f1d3a987975a6b2c86c7178eb8bcf454234 SHA-256: 1bc76b56340a984feb0b33e6b69eb29d17ab0b39ec5e4135a14ce27304ca81b4

166 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, which is heavily obfuscated and utilizes eval() calls, a common technique for executing malicious code. The ClamAV heuristic 'Pdf.Exploit.Agent-36086' strongly suggests a known exploit. The presence of large, obfuscated JavaScript streams indicates the primary function is to download and execute a secondary payload, typical of a downloader or initial access exploit.

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` `fd1004a54a648e3905bee73a731587c5e837b2f32f22212d043785c423236583`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	426181 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).
`legacy_pdfkit_stage_000.js` `b6cbb6a01b1c1e37fc4f145e7ea778f2b3f02a339099a1a7fecb43aa6ec5980b`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 717 long base64-like blob(s).

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