PDF malware analysis — malicious · 5c2695fcf71c5ff6

MALICIOUS

PDF

9.5 KB

MD5: 24096c4a66be8ec3a0d0adfd4bfbbb34 SHA-1: 0a1aee86415f593e7a78ba70b158ddb3f34a2615 SHA-256: 5c2695fcf71c5ff6e42cbb442d7771f222042e66f446bae58667865b4bb705ff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode(), indicating an attempt to execute arbitrary code. The PDF JavaScript exploit cluster heuristic firing further supports this. While the specific JavaScript payload is obfuscated, its presence and the exploit cluster strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.6854

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.
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. (matched inside decoded stream)
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. (matched inside decoded stream)
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)
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off000004a8.bin` `350520b8e27ba56f6aa61773cf7f32e455af5c1c7d24474fc350bace5ebedb2b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A8	4796 bytes
`objstm_0025_00.bin` `cd0f53d9a4e28e71eba90dd8fba2226c06b41f506bda1d0aca160e49fc6bae98`	pdf-objstm-decoded	PDF /ObjStm 25 0 obj (inflated)	428 bytes

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