PDF malware analysis — malicious · 4b6d9c0ed79fcb1f

MALICIOUS

PDF

118.5 KB

MD5: 2a85a438cec98afb8ea0d11747f58a15 SHA-1: 4bc5ca1c4c06cabc986a272a025ec25c9630805d SHA-256: 4b6d9c0ed79fcb1f0560c06b2038a6e8fdbead93d5e6983438ceab6e7c552cb9

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file that contains embedded JavaScript. Heuristics indicate the use of eval() and fromCharCode, common techniques for obfuscating malicious JavaScript. A critical ClamAV detection of 'Pdf.Exploit.Agent-36086' strongly suggests it's an exploit delivery mechanism. The presence of large, obfuscated JavaScript streams further supports this, indicating the script likely downloads and executes a second-stage 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` `9d8dcc3f562899e805261e4ced46cb5b16564c775345249f4549cfd4a43a4d1f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626494 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` `99289d9ccb43a3358d90be9091970e3a42e56f902ccd92ebb66543b764613243`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 527 long base64-like blob(s).

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