PDF malware analysis — malicious · a1c09daa7145bdec

MALICIOUS

PDF

69.9 KB Created: 2010-03-14 07:18:43 Authoring application: NeGPRtzIZm (via mmSOnd4)

MD5: fa92e7c8e8d32f3de71a0993261c6cd6 SHA-1: 001f780e9bdd8a5cb7f60224772e9ada87bd7029 SHA-256: a1c09daa7145bdecea36fa686ccd2bcdcdb4eb76ac7788003e7d68d36f605763

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a ClamAV signature (Pdf.Exploit.Agent-15599) and a machine learning classifier. Static analysis revealed embedded JavaScript with eval() calls and fromCharCode usage, indicating obfuscation. The JavaScript action and embedded JS stream suggest the document is designed to exploit a PDF vulnerability to execute malicious code. The primary intent appears to be downloading and executing a second-stage payload, as indicated by the ML classifier and the presence of an embedded JavaScript file.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Exploit.Agent-15599 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-15599
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_obj0007_000.js` `98fcf2764716acc947010492eb8adb11be19ae3d0ac3504cc57966fad74bfe59`	pdf-javascript-stream	PDF /JS object 7 at offset 0x234	70346 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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