PDF malware analysis — malicious · c988c344801ed3ce

MALICIOUS

PDF

12.3 KB

MD5: bff752a8c3f16f7711ade17ecb530787 SHA-1: 636c1dcc70be071094321a2ae9aa5c92f7e1f714 SHA-256: c988c344801ed3ce12dbe3aa3933d2d39460b8436f06f17c3e093636feaaf015

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file was flagged by a machine learning classifier and ClamAV as malicious and obfuscated. 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 extracted artifact 'javascript_obj0007_000.js' is likely responsible for downloading and executing a second-stage payload, though its exact functionality is obscured. The overall attack pattern suggests a phishing or malware delivery attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `8b4936ffdfa248337bce0aac0570171976ba10beab2b3d5a20cc13d64daa48b9`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19E	13036 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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