PDF malware analysis — malicious · 39ee23a3fee15c2b

MALICIOUS

PDF

14.5 KB

MD5: a69ade79a7a7872fbf55706060a07944 SHA-1: 7ce15b15f84873123c6bc7aa557ca1de9ed8ae7a SHA-256: 39ee23a3fee15c2bd000ecebc0a97294831ee5e9aaa36c6c1e0b7a794f8a649f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Static analysis revealed embedded JavaScript with obfuscated code, including calls to String.fromCharCode and eval(), which are commonly used to hide malicious actions. The extracted artifact 'javascript_obj0076_000.js' likely contains the payload execution logic. The ML classifier's high confidence score and the ClamAV detection strongly indicate a malicious PDF designed to exploit vulnerabilities or trick the user into running a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
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_obj0076_000.js` `c28effae366bd4b2a63fe29aea090a07947ae4e73aa9efc1cf87e16e006e7288`	pdf-javascript-stream	PDF /JS object 76 at offset 0x38D4	144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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