PDF malware analysis — malicious · ab91e7be223dd8dc

MALICIOUS

PDF

4.1 KB

MD5: a64a9879480cc85355abf5564797de5c SHA-1: 09ec1c3ae4850e158baf807eeb4182323aaf6712 SHA-256: ab91e7be223dd8dc54d76a24a2d55ae7bbfd6336b990080777a9a9d297f6693f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a dropper. Embedded JavaScript streams, including one identified as deobfuscated, indicate the presence of malicious code. The heuristics suggest the use of eval() and String.fromCharCode, common techniques for obfuscating JavaScript payloads designed to download and execute further stages. The ML classifier's high confidence score further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-5343095-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5343095-0
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` `0c7476bef085424ce391c572307cf5d2353e983512fa25dc75d4291bdf2f6850`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6421 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` `d6c6154566592c2bfdce5f532ae5a79150c10f8518b7b473992b0de361cf5ea2`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3662 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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