PDF malware analysis — malicious · 5d5672f61bd4c34e

MALICIOUS

PDF

46.1 KB

MD5: abd024739f89c508c9f612c93d91d8ec SHA-1: 1ca412fd17d87c129d947c8616cca616787caa6b SHA-256: 5d5672f61bd4c34e344b0345b706714ff21585fcb81fbf48c689445e4941aac6

118 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, identified by heuristics like PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The JavaScript code, after deobfuscation, appears to construct a URL from the document's title and then execute it. This strongly suggests the PDF is designed to exploit a vulnerability and download a secondary payload. The presence of XFA form elements further supports the exploit cluster finding.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.bitstream.com
- http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `bf92a975d89cd12b9177e2a3d32fc24114d6157fd49a1ce81b0db424a8bbcbde`	pdf-javascript-stream	PDF /JS object 12 at offset 0xA0B9	789 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `7e41c9129274a57f3ea5a1a70cfa488395ce774d9b10fd5c0faac45b367ad964`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xA0F4	361 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`font_00_sfnt_off0000033c.bin` `5434b4545f9dd0c70f0cb84a8751c0ceb75c5dc11d0f53fbefd0d5224936edaa`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x33C	65932 bytes

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