PDF malware analysis — malicious · 20e48d094b9d721d

MALICIOUS

PDF

118.5 KB

MD5: 83b0030055d98516c64716beb156a6f0 SHA-1: c2d251df91613555a1745f0b4b42af4aa126eb09 SHA-256: 20e48d094b9d721d5a9bbff912b09f5dc09de85eacaae606823db7194886c485

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including obfuscated code with `eval()` calls and `String.fromCharCode`. Heuristics indicate a large comment-padded JavaScript eval stager, suggesting the script is designed to download and execute a second-stage payload. ClamAV detection confirms its malicious nature, identifying it as 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` `3faf7180a03c664f8549f88766d17b5ce46f19199f562f9b2198ba920e9017aa`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626675 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` `ef9f9746dd6b8f310c8d8e3f358f716ff0197f813f3bcbd41374ed3854e0dbfb`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 617 long base64-like blob(s).

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