PDF malware analysis — malicious · abf0b57582957250

MALICIOUS

PDF

4.0 KB

MD5: abff4a4c904d21f7567b97356326fa1b SHA-1: dd263a5f10f63a850a905ffdad69240d3ea6fdaa SHA-256: abf0b57582957250415d10e60ee11544d3a4e84d193cbb91cc9908d93e9b9deb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identifying it as Pdf.Exploit.Pdfka-103. The presence of eval() calls and String.fromCharCode within the JavaScript stream points to obfuscation techniques used to hide the execution of malicious code, likely an exploit targeting PDF vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Pdfka-103 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Pdfka-103
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. (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `be0360f42fcbd0969239324d18574437ec5f2012ba5f53edead357168832e917`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `9f511902f8466e122609596f540ebc03f164ade76c24c5b48b25cef83f367568`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3581 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.