PDF malware analysis — malicious · df37175c16a31fd4

MALICIOUS

PDF

147.2 KB

MD5: e9ba75fb846b3f6eb631ac85bc1530d0 SHA-1: 25cd07d50d6057085ca639ee033952e938ab8dca SHA-256: df37175c16a31fd47c7acb5d8ce3394571066e5c6d43675e4cfd8e1e56fba5c7

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it contains an exploit. Heuristics show embedded JavaScript and the use of unescape() and ASCIIHexDecode filters, common in PDF exploits. The embedded JavaScript streams, though obfuscated, likely facilitate the execution of malicious code. The primary attack vector appears to be exploiting a PDF vulnerability to deliver a payload, with the URLs pointing to potentially malicious or related resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 8

ClamAV: Pdf.Exploit.Agent-36189 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36189
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0013_000.js` `c263b6585a2938ade658b0919b210d7a3adcd59b42c2f1922fea5dc7636da7d2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	27637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `042826512f8f9a79e7b22c98b500d3e175ac3e16fdbebf7a3531b15b120a9317`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1056D	27645 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`font_00_sfnt_off00000352.bin` `a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x352	65932 bytes

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