PDF malware analysis — malicious · 3a48c3b94c259520

MALICIOUS

PDF

8.2 KB Created: 2010-02-11 02:56:51 Authoring application: fYKQNwKbbcNkuBZO (via SuqSZuLOkFkwewA)

MD5: fe8e0bf2176b5b729e305d615b2f9199 SHA-1: 31ad4e1c05796d54f016da0beafb167f21c2a300 SHA-256: 3a48c3b94c2595207242dff64bdc2845fb2ec3f4438aace89e43c066ce66dc4a

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-35572 and a machine learning classifier indicated a high probability of maliciousness. Embedded JavaScript, including the use of String.fromCharCode, suggests an attempt to obfuscate malicious code. This JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Suspicious extracted artifact' heuristic. The document body contains generic text, but the presence of JavaScript and the ClamAV signature strongly point to an exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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_obj0007_000.js` `34501e8be351fe6927daba5a8abe8d8b404f1e730e33e13c95f5e343c213c8f9`	pdf-javascript-stream	PDF /JS object 7 at offset 0x324	6792 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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