PDF malware analysis — malicious · 1f9b59bb934365fe

MALICIOUS

PDF

2.8 KB

MD5: 06fb1f6aa46bd677608173c74b9343ad SHA-1: 3ed72e5f35bdc712d8814ea80473e75b60989bd5 SHA-256: 1f9b59bb934365fe8dccff52b4b6e6eae54c3707d11327542d479da3ddbad308

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Dropper.Agent-7237450-0 and a machine learning classifier with high confidence. Heuristics indicate the presence of embedded JavaScript, including eval() calls and String.fromCharCode, which are commonly used to obfuscate malicious code. The extracted JavaScript files suggest an attempt to download and execute a second-stage payload, typical of a dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7237450-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7237450-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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_obj111611_000.js` `fb6fc5edd28f13f8b20ed4a6e8b09e2c9d32ed722bab208e39ce9eb6d0cdfb77`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	259 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `2a25e48c95c66707af92f0039cb9ffe4cac44cadbe5a7a0b08d0d6534067654a`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x269	3369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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