PDF malware analysis — malicious · b601a564195b3bd1

MALICIOUS

PDF

15.7 KB

MD5: 20be5739486ee21c94149bc9821113a3 SHA-1: 0799681cc0f706cf5479955e752f1394cd925fb1 SHA-256: b601a564195b3bd145e19dbb3d20fcd099cd0342a852a9f1e877b2f25532a3c4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The critical ClamAV detection and high-severity heuristics for JavaScript eval() calls and padded eval stagers indicate this PDF is designed to execute malicious code. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is the primary mechanism for this execution. While the exact payload is not discernible from the static analysis, the presence of these indicators strongly suggests a downloader or exploit delivery function.

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` `7bbe0646da64f64e4b36b7afe2442f1d442a5253dfa6ebd1c799605f282964bf`	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).

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