PDF malware analysis — malicious · 3762e683d5c1b849

MALICIOUS

PDF

4.0 KB

MD5: 030f525985fc055ef360ba4d15e39a22 SHA-1: 3c4cd3804a00a06dbf38f087de5d4c80955eb29d SHA-256: 3762e683d5c1b8492baadeb72930157f6cc9c3a4b3af066af557960e63448542

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of deobfuscated JavaScript files (acroform_b64_00.js) points to the execution of obfuscated code, likely to download and execute a secondary payload, which is a common dropper behavior.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7249238-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7249238-0
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` `5c1f487203e7365b58a5f6625a9a84db06c7519d257d90ac97be04fc7e7957fa`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 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` `82fd46c1b402f41811117d819ed44db5818534c40ace2d0f3c7c1a74668af425`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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