PDF malware analysis — malicious · 4a78880275e3b222

MALICIOUS

PDF

13.2 KB Created: 2009-06-15 13:15:09 Authoring application: kPHbJqIAaNCtPiz (via mnNTAkSitJijiaHbVX)

MD5: b68b024d938fe286c89b2a596014764d SHA-1: 422c1c880251e9e2579b5228fa98c82bdd888116 SHA-256: 4a78880275e3b2227ba12ef20d871811a15275e79be460ddf6f7ec2297c15e1a

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample was flagged by ML classifiers and ClamAV as malicious (Pdf.Exploit.Agent-35572). It contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics, and uses String.fromCharCode for obfuscation. The ML classifier's high confidence score suggests a known exploit pattern. The embedded JavaScript file, 'javascript_obj0007_000.js', is the primary artifact, 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` `aade66f4d8e04d797c69fa0b627b0696648bbc8671d3e89d94e9fb73b17a6b1c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4E3	11435 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 39 long base64-like blob(s).

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