PDF malware analysis — malicious · a7c72f7d61c46e74

MALICIOUS

PDF

26.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: a59f83e42bb722b4e0f1989fa10cb47a SHA-1: 233d18555aa547282d9c97b188a2c993ecf51c96 SHA-256: a7c72f7d61c46e743f878801d6d9339664c049954fd5d62b7e69711228c1ff97

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

This PDF file was flagged as malicious by ClamAV and an ML classifier. Static analysis revealed embedded JavaScript, including calls to eval() and String.fromCharCode, indicating obfuscated code execution. The primary heuristic indicates the use of JavaScript actions within the PDF. The extracted artifact 'javascript_obj0001_000.js' is likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Malware.Agent-9825229-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Malware.Agent-9825229-0
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.
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_obj0001_000.js` `511822b60fac9eb0859d7e8aa83a380e6b27b3353e910d890ae4e84720e86d77`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	1047 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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