PDF malware analysis — malicious · 5bf188f7ce663a35

MALICIOUS

PDF

147.8 KB

MD5: c014bd0d36f240e23089772884120b61 SHA-1: 67c1c923c0a57086b1e4b212035bbf49eb7f5cb9 SHA-256: 5bf188f7ce663a3523c94295388e0b461f038c09fbe306bc754195e4c2a47ceb

128 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains multiple embedded JavaScript streams and XFA form data, triggering critical heuristics for JavaScript exploits and eval() calls. This indicates the document is designed to execute malicious code, likely downloading and running a secondary payload. The presence of obfuscated JavaScript and exploit cluster signals strongly suggests a malicious intent, though a specific family cannot be confidently identified.

Machine Learning

Nyx PDF Classifier clean score 0.0872

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.
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)
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic (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.
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/pdf/1.3/
- 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/AcrobatAdhocWorkflow/1.0/
- http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off00000775.js` `382beb763ed1acfe6e3091bd67b6b3ab5f47a72f68d3e7d2c93fb838d22ad19b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x775	1634 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_004_off000009ac.js` `30c93741d788434930b3dc451ec85f07ef5aea50c1dfe8c88829c4198544f5de`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x9AC	1533 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_044_off0000f3e6.bin` `0877afcafff88808b1896fd7e130ae48c3b44252144db9791e3c61a155f7f24e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF3E6	18912 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`objstm_0063_00.bin` `2c41215fe6c15249e564baf3444f23b8303b7f95725f0371e5b717e3cb6df45b`	pdf-objstm-decoded	PDF /ObjStm 63 0 obj (inflated)	12270 bytes

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