PDF malware analysis — malicious · cf505d154cc9ae7b

MALICIOUS

PDF

118.6 KB

MD5: ba8da97b2e57efb79eb124fb1e3cc2c8 SHA-1: c7b24470e7ecef90af4950df2ddb4c2824cc9d06 SHA-256: cf505d154cc9ae7b85fb26fa1cce2a24741d3d3437964d0e36ca422f7669feb2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscation and dynamic code execution. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly indicates malicious intent, likely involving exploit delivery. No specific URLs or further payloads were directly extracted, leading to an unknown family classification.

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` `d189f0298288bf5378cef05b87432df367a853d3eded8913d427aaa0a7d928fe`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626551 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` `3c34e2f4ef039ef0551f97d4aeccb4953b19d734381ce68f26f4d4b636fa843c`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 561 long base64-like blob(s).

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