PDF malware analysis — malicious · 48de8a080c98af2b

MALICIOUS

PDF

118.5 KB

MD5: 35db0a80368d34f18df37ad361222a95 SHA-1: c485e12f734d32d79ccf7ba48ca175e35d28783f SHA-256: 48de8a080c98af2b52b7ae5b45d8021862b21aa6def1ff6c5762aed236185433

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode, which are common techniques for obfuscating malicious code. The heuristic 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' strongly suggests a stager designed to execute further malicious actions. ClamAV detection of 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary attack pattern involves exploiting vulnerabilities within the PDF reader to deliver a 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` `5e5a48b94f0b12f42a8288348cc80ed24e55732c908d96d8d092c2dd6a2bef78`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627760 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` `f9374740c9d76d9b098044b9a6ff31855752bf5c605e9f3773cf8ceb1fe5608a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 688 long base64-like blob(s).

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