PDF malware analysis — malicious · f25d476b7b2d5845

MALICIOUS

PDF

4.0 KB

MD5: c2a022707a819aae7ab898aca4129070 SHA-1: fb0db5a7ef6d1bd1123f7f42159c28364cec0059 SHA-256: f25d476b7b2d584594449298f3a66d8c34e178be162b6769507eeb9d2f4c3ef3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript, including a stream that uses eval() and String.fromCharCode, indicating obfuscation. The presence of extracted JavaScript files (acroform_b64_00.js and javascript_obj0013_001.js) suggests the script is designed to download and execute a second-stage payload. The exact nature of the payload could not be determined due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7323109-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7323109-0
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_obj0013_001.js` `caad04aa77d106a1600bc6ee587c9a12fc86e14ddc64dd693747531f97eb6261`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6289 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `cad2aa8f9f35d5ea242e9871ccd841c93916ff73c13ed3d920f25388f3bfd50b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3563 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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