PDF malware analysis — malicious · 413ecf8bc17ff892

MALICIOUS

PDF

15.7 KB

MD5: 09bbb774deb81934205aecf34259b2c2 SHA-1: 4600d906d8a6f08db93ca6157c6f68338ef3b8d4 SHA-256: 413ecf8bc17ff892648bcaaa5263536af641b1f529fad3631529c277caf9e8e4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, common techniques for obfuscating malicious JavaScript. The presence of two JavaScript files, 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js', suggests a multi-stage attack. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and execute a secondary payload, as indicated by the ClamAV detection 'Pdf.Exploit.Agent-36086'.

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` `f9c1b05505936c62e69812ae6b07a5a142e381ebeee04d2293f8536bc158977a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425197 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` `dc059e5c2be1f228b1eed2cc93226090ce335f7106ece86db7207127c5964a49`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 665 long base64-like blob(s).

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