PDF malware analysis — malicious · e1fa5f4fc5ee40cb

MALICIOUS

PDF

147.5 KB

MD5: cfd23208f9ba23e0b00499816047d8d7 SHA-1: 2d36b43634d50025412de6d719d2ec0229a6f39d SHA-256: e1fa5f4fc5ee40cb21c5944d0976712c4ce8332e1f2e25b6f06cb6cdd8cd3dd4

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript streams, identified by heuristics such as PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the 'unescape()' call and the presence of obfuscated JavaScript files. The embedded URLs, particularly 'http://www.bitstream.com', are potential indicators of compromise.

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` `76174b40352c1fe53a9703e353c96a06592f8dc70080b7ba03a587dae44e56d5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	27749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `cc783fa2d266754abae3aa5738d8ddf35743d22a7965a7ddeb0a3b69583e8bfa`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1056D	27757 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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