PDF malware analysis — malicious · 287da48a2436db79

MALICIOUS

PDF

118.5 KB

MD5: 40acbd9fc760135e0ce9d14dc5e1652e SHA-1: 69d1d6004fc537216a70284a2d52cd71ac225270 SHA-256: 287da48a2436db79371c3da4c53f6224d2e63b65da6219e0115100e98d05d387

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, including a heavily obfuscated 'eval' stager. This stager is designed to decode and execute further JavaScript, which is a common technique for downloading and executing additional malicious payloads. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit. The presence of JavaScript actions and eval calls points to T1059.001 (PowerShell) or similar scripting execution, and the overall nature of the file indicates T1204.002 (Malicious File) and T1566.001 (Spearphishing Attachment) as likely delivery and execution methods.

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` `794b4f54014e02b8fb18367bd98ae51d2dcbce32322ff1e6aba7c2136194cb84`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626860 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` `93e38e595c2d050b9ac36414f496e52affc40812a0582ac6132e11dae55cc1c5`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 668 long base64-like blob(s).

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