PDF malware analysis — malicious · e21c5f0657f2ef68

MALICIOUS

PDF

2.9 KB

MD5: ddcf5c772899cc550c4a7ee014bc3355 SHA-1: 2cd16beb9541a5fd845331734147ceb0bf12d2d9 SHA-256: e21c5f0657f2ef6898343ea1dcd48d2d26b7c249842c278bd3de47597eb5d471

116 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, which identified it as Pdf.Dropper.Agent-7685827-0. Static analysis revealed embedded JavaScript, including the use of 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 presence of a suspicious JavaScript file. The extracted artifact 'javascript_obj0009_000.js' is likely responsible for this malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Dropper.Agent-7685827-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685827-0
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `18e56b3e77d864ece6c068ad70b6186cd0a77291dbda782624aa3952ea33cb03`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	20609 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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