PDF malware analysis — malicious · a42daef9363c3be7

MALICIOUS

PDF

15.7 KB

MD5: c81a00f300eec26c2f6cff0cd2be52c4 SHA-1: 48a58bfde95c3909fee2eaa04dce99920c5cd091 SHA-256: a42daef9363c3be725e6ac8fefa2537a856c14d05bc768f65807b75712cff7e0

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains multiple high-severity heuristics indicating the presence and execution of JavaScript. Specifically, 'PDF_EVAL' and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' point to obfuscated JavaScript code designed to be executed. The embedded JavaScript stream 'javascript_obj0006_000.js' is the likely mechanism for this execution. This pattern suggests the PDF is acting as a dropper or exploit loader, aiming to download and execute a further stage.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `c357eedcfef7f8bc38d28b164fdbbbdee049bb3474193e6706e05a79af75e141`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425033 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).

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