PDF malware analysis — malicious · 13c50f30c7554f57

MALICIOUS

PDF

221.4 KB Authoring application: PyPDF2

MD5: e24408ad259d1f29fc20003baf682853 SHA-1: 067d8b5bd762ebc8ae2ca6320f1b3dfff09e17b2 SHA-256: 13c50f30c7554f5728b3ca7f77195a388e386b084f39086ebeb10b443340161c

136 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript streams that are heavily obfuscated, indicating an attempt to hide malicious activity. Heuristics indicate this JavaScript is part of an exploit cluster, likely designed to download and execute a secondary payload. The ML classifier also flagged this PDF as malicious. The obfuscated JavaScript streams are the primary IOCs.

Machine Learning

Nyx PDF Classifier malicious score 0.8428

Heuristics 6

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.
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.
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `45860bc9b4c8fcf2205599d6c0929e02b7d45abbb7407e2d0b5eb57af685ec27`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1BB	3257 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 hex-escaped blob(s).
`javascript_obj0006_001.js` `12d7020920468ab59e56c545adaf873145018c325410f470d56cea65a018140a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1BB	3008 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long hex-escaped blob(s).

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