PDF malware analysis — malicious · c43f4abc354ce668

MALICIOUS

PDF

15.8 KB

MD5: 1a13cf94fc03a987a82c76441386f60a SHA-1: ca532f05330828c8f7a78d7e4211bbff0dc5b04f SHA-256: c43f4abc354ce6689cc77f9e87f463da18112124baf4d45c738bf6b945e7e655

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This indicates an attempt to obfuscate malicious code execution. The presence of `eval()` and `String.fromCharCode` further suggests dynamic code generation and execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly supports a malicious intent, likely involving exploit delivery.

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` `e9fa70eb5eac35a508ceda077ee63e1dc31c8840b16dff10314385824b05a16e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425108 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` `3811d0761eccdf98baa21f2710bd8c8ac0e19f092d9fa8094307250550ab9d5e`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 586 long base64-like blob(s).

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