PDF malware analysis — malicious · 11bc71598ac24270

MALICIOUS

PDF

3.8 KB

MD5: b57c9d9d7a5d3cd592640c1077ef9990 SHA-1: c916095459f64be67b22398ec31eb279c86e1705 SHA-256: 11bc71598ac24270d13eccadb6e20c6ef89feaf5ca12026a32487ae6f2475d77

234 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, which is a common technique for exploiting vulnerabilities in PDF readers. The JavaScript is designed to download and execute a secondary payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics. The ClamAV detection of Heuristics.PDF.ObfuscatedNameObject further supports this. The primary attack vector is likely spearphishing attachment, leading to client execution via the exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `03944cc4c54d94f6c8ebb2f45222b876da48057c3a06acb3b7d790a2935bea14`	pdf-javascript-stream	PDF /JS object 5 at offset 0x173	15435 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). Carved artifact contains 1 long hex-escaped blob(s).

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