PDF malware analysis — malicious · b147f4861a39b993

MALICIOUS

PDF

7.5 KB Created: 2009-03-25 12:28:39 Authoring application: bhsbhowVZtIRHpKC (via tlsroYouwFRFlhGTn)

MD5: 0c1ca3b8d8438cee3acf08677d85f9ec SHA-1: e93cb88309ff840fbb2e7f73412c83e775a4bd98 SHA-256: b147f4861a39b993e7282e11f88d9129b0b55e6fdd5a9756638053b03a9fef81

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it contains an exploit. Embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics, is present and likely responsible for the malicious activity. The extracted JavaScript file, 'javascript_obj0007_000.js', is the primary artifact associated with the exploit. The ML classifier's high confidence score supports this assessment.

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` `ca254ec51096f3cc653800e18480f201cbe42be06755e0bd44ab82ff3bd264f5`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2D6	6154 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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