PDF malware analysis — malicious · 87b4e8d04581e410

MALICIOUS

PDF

4.1 KB

MD5: 922f7e59c434e828b76879b1e1be9d39 SHA-1: d7370de65c5fe0555b57047b5b665f747bbcc231 SHA-256: 87b4e8d04581e41072ced0cd7e6bab6f84f816e4f2bed8d0c55c0d897f490939

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscation. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' heuristic and the ClamAV detection name 'Pdf.Dropper.Agent-7279456-0'. No specific malware family could be confidently identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7279456-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7279456-0
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` `2ba9900c1f9b229f3116df4422bb2d611cd4bf43f952f383e32b5657938d5980`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6361 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` `f4fa1db5dce8692947b6ed146df730333e0c774eab503d294358d5dd51448800`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3618 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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