PDF malware analysis — malicious · ffc8716d5b968f9b

MALICIOUS

PDF

12.2 KB

MD5: 6c1eea4047dffbfec046d8915ea2d06a SHA-1: bad17eff79f0f64b2a7b6b3d7655f4963a134ce3 SHA-256: ffc8716d5b968f9beac71881193b16a32669c02c66f1084e32d8c015a59c2d5a

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a dropper. Heuristics indicate the presence of embedded JavaScript, including the use of String.fromCharCode and ASCIIHexDecode filters, which are common techniques for obfuscating malicious code within PDFs. The embedded JavaScript stream is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Pdf.Dropper' classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7329454-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7329454-0
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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. (matched inside decoded stream)
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` `cbe949374225b8d7a020a1c1d076d95f967fc313b62e6107dad8af7ea3f4833b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19E	12822 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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