PDF malware analysis — malicious · a41c621db484718a

MALICIOUS

PDF

118.6 KB

MD5: 260b5d984842420e2be09e723ec73c11 SHA-1: 0835d15915af251e5d0b03b5e253a95c447cc91a SHA-256: a41c621db484718a62b367a4fefb2d3e3262ef4d848d83f2bbb1e5f4404895ca

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains multiple heuristic firings indicating embedded and obfuscated JavaScript, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36086'. The presence of 'eval()' calls and 'String.fromCharCode' within the JavaScript streams strongly suggests an attempt to execute malicious code. The obfuscated nature and the detection name point towards a known exploit pattern used to deliver further malicious content.

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` `63214a53930868414812b1823e1955445a707c54d472bce1a687300a7bb30f14`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626673 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` `9e0b656b811c3e04f267e4d7d0b375f9f3ffd98ea70554c32b31678805c54027`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 606 long base64-like blob(s).

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