PDF malware analysis — malicious · bf315352c48d6dad

MALICIOUS

PDF

118.4 KB

MD5: 09ec736653c3494287edf1d0093a59d6 SHA-1: f1a81fa335a9dff41baac8e24439a5ddac093cb8 SHA-256: bf315352c48d6dad6252a15fc1f70fd2d442534333a78189f0b82b75e7975c94

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is responsible for executing a malicious payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms the malicious nature of the file, indicating it's an exploit targeting PDF documents.

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` `4901040ae400df257d7258b2a6faa7ff283e90cb3bf69f36730ea9535342048e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627119 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` `5b1cbdd0231a3731f9ce79bf8d05c1d68b4192392d2db1959437d5413ec4f687`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 621 long base64-like blob(s).

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