PDF malware analysis — malicious · 0a98598eff8255e5

MALICIOUS

PDF

121.8 KB

MD5: 53cb91bef4979a3d883fc8847c9ddad4 SHA-1: 6af51782625d45ee898d84133072d9fcac8f3664 SHA-256: 0a98598eff8255e588c050abaf358bffe4c4670f59420965b19555caabbae5c2

136 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript and a critical heuristic firing for an embedded PE executable payload. This strongly suggests the document is intended to exploit vulnerabilities and execute a secondary malicious payload. The presence of JavaScript points to T1059.007, and the embedded executable suggests exploitation for client execution (T1203). Given the nature of malicious PDFs, spearphishing attachment (T1566.001) is a likely initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9569

Heuristics 6

Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
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. (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)
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (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://cairographics.org
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_007_off00002274.bin` `526275020c87fb52390a1b462bf9719af6f14c316f76f89858a5af309a7609b8`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2274	130560 bytes
`stream_008_off0001e386.bin` `fb4d311b3b18a83cbc38957768042c45c651414f30fd1730e383914af66fdbd1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1E386	685 bytes
`objstm_0024_00.bin` `f42edcce17b74858b55b0de5a48e03cc503d03da0612639bc962d62543833294`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	1159 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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