PDF malware analysis — malicious · c67d8a5e8aba0041

MALICIOUS

PDF

146.9 KB

MD5: 39af29a355137a3446ac39682e29eb51 SHA-1: cd555ce042a56ff83e57069f840603968ea5d825 SHA-256: c67d8a5e8aba00417a11aa7789c52b2c48aec665e8848afed88b0e083bfcc67f

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV and a machine learning classifier, indicating it contains an exploit. Heuristics indicate the presence of embedded JavaScript, including the use of unescape() and ASCIIHexDecode, which are common obfuscation techniques for malicious scripts. The embedded JavaScript streams are likely responsible for downloading and executing a second-stage payload. The presence of multiple XFA-related URLs suggests a potential exploit targeting XFA forms.

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` `260b025e2ec91e6316c4b637a03d8dca74bcfd28d4dfc4e9f9c9dc1528cbcf68`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	27541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `8881542be24c5ed18822c0f675e03a074a570d31e3d25415b68699c6d2d541c4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1056D	27549 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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