PDF malware analysis — malicious · d11dc5e3bc7e7140

MALICIOUS

PDF

118.6 KB

MD5: 2603f467086573b2f07d0f913fb1ab83 SHA-1: 1379ac6e792043af9fce98378a1e4709fcc6d9f3 SHA-256: d11dc5e3bc7e71404fc4de924b297ec426492ad977dba8be25c17494d740cb07

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a large, obfuscated eval stager. This script is designed to download and execute a second-stage payload. The presence of `eval()` and `String.fromCharCode` indicates heavy obfuscation, typical of exploit delivery mechanisms. ClamAV detection as 'Pdf.Exploit.Agent-36086' further supports this assessment.

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` `12987268dc832b552e42eb9b8b51c336db0004ad8c0cc30fc202b4f8534bca63`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627638 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` `c250ad645471c160ee1dfdb17596cbffb8bb3d80d3b7c395fe6ce77eb957b621`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 653 long base64-like blob(s).

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