PDF malware analysis — malicious · f49d670f3efffbef

MALICIOUS

PDF

15.7 KB

MD5: 7183615bec7739d350a02162f138f999 SHA-1: 05be4e0a9f8b895a171ecfce96d926866550296f SHA-256: f49d670f3efffbef7e4aa46f7b4f491598868d0bd9e85002ab5ef1b80f105ab9

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious JavaScript

The PDF contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. This suggests the script is designed to deobfuscate and execute malicious code. The ClamAV detection of 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The embedded JavaScript files, 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js', are likely components of the exploit or payload delivery mechanism.

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` `030f85bc24c9403a35839f74743df752fe1953121e8aed46551249bd30a008af`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425484 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` `8459f2c4a32e31ac036cb898cbda93292362e103b1932e5a7cdc409fdd8a7f06`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 668 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.