PDF malware analysis — malicious · a83afe72264f0fec

MALICIOUS

PDF

8.7 KB Created: 2010-06-18 10:48:07 Authoring application: nzLsnzWSSHjxLkuPQy (via wJxrQIqxDOqgqoLIFNmk)

MD5: f70ffd5e30949a66566a23b20d7a8daf SHA-1: 8304f75df6b9456f472b902f797c68076df40d65 SHA-256: a83afe72264f0fec9b56b3f2293c7c012815c75e4b414f7f105f5201ad322ada

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file was flagged by ML classifiers and ClamAV as a malicious PDF exploit (Pdf.Exploit.Agent-35572). Heuristics indicate the presence of embedded JavaScript, including the use of String.fromCharCode, which is commonly used for obfuscation in malicious scripts. The ML classifier's high confidence score further supports the malicious nature of the document. The embedded JavaScript is likely responsible for downloading and executing a secondary payload.

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` `d6bf14145a719b3dd3e431cc15477f57a19bb5475b1a55f908df4902cb77cd61`	pdf-javascript-stream	PDF /JS object 7 at offset 0x404	7125 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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