PDF malware analysis — malicious · bbaf8b22cfbc1a3e

MALICIOUS

PDF

14.6 KB

MD5: c02801b9e7f677ad4b2c9047625df16b SHA-1: 9df9742c26f9ea39d939cf9b77892d7aaf3b54f0 SHA-256: bbaf8b22cfbc1a3e4647c16a9a0183326c964dea4bc7b8c013fb50c4f07b7f8f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

This PDF file was flagged as malicious by a ClamAV signature (Pdf.Exploit.Dropped-94) and an ML classifier. Static analysis revealed embedded JavaScript containing an eval() call and String.fromCharCode, indicating obfuscation. The presence of JavaScript actions and an embedded JS stream strongly suggests the execution of malicious code. While the specific JavaScript content was not fully detailed, the heuristics indicate it's designed to exploit PDF vulnerabilities and likely download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
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_obj0076_000.js` `c28effae366bd4b2a63fe29aea090a07947ae4e73aa9efc1cf87e16e006e7288`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3936	144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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