PDF malware analysis — malicious · 9ff26fd300554a5c

MALICIOUS

PDF

118.6 KB

MD5: 53fcce3912ea03b992e5b73e1f1b5789 SHA-1: 34aefc22874416d96e826a2fcf2ed6ffee0ce93a SHA-256: 9ff26fd300554a5c07050e32ace60ade3fdde765fc2aa539a193e863cc2c0368

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager and multiple calls to eval() and String.fromCharCode(). ClamAV detected this file as Pdf.Exploit.Agent-36086, indicating it is a known exploit. The presence of JavaScript and the ClamAV signature strongly suggest the PDF is designed to exploit vulnerabilities and deliver a secondary payload.

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` `d8e31204aa9c4d672edb5a83d94202ad5380d2cf96ff0bcc128ff1bbf7fa2779`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626921 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` `c50442c65a1a4c02b6c76b598bab5d1e84abc39816785192e824e5652df7eb91`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 614 long base64-like blob(s).

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