PDF malware analysis — malicious · dff8b71561edc796

MALICIOUS

PDF

9.6 KB Created: 2009-09-14 22:56:02 Authoring application: gLYcamNOPlfEYE (via UXrfNLijPzePXF)

MD5: 194030ef77514d3cad3b23d9fa3a0160 SHA-1: 85c409539b475b021053f48fb5b620dbe4d7c9e0 SHA-256: dff8b71561edc796ac5651d35c55149719e8cd7811c1fea87632b67d0d4dedb6

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample was flagged by ClamAV as Pdf.Exploit.Agent-35572 and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the presence of embedded JavaScript, including the use of String.fromCharCode, which is often used for obfuscation. The embedded JavaScript stream, named javascript_obj0007_000.js, is likely responsible for executing the exploit. The ML classifier's high confidence and the specific ClamAV detection suggest a well-known exploit pattern within PDFs.

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` `6b115951f84f892de19c9c832c647adf3d28a0dd7ea931a6d874e743b2a7d9d3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x488	7890 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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