PDF malware analysis — malicious · 1e09ec082e944f19

MALICIOUS

PDF

146.6 KB

MD5: 33e47cebd1242e575f2391c3f56cbad5 SHA-1: cdb95a1936e19fd4b6a8dbc079a8fd91976e4b26 SHA-256: 1e09ec082e944f1983fb5528b146f5537c4377e24ecb5594e17bb51a3b9e7517

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 a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and the use of PDF-specific exploit techniques like unescape() and ASCIIHexDecode. The embedded JavaScript streams are likely responsible for downloading and executing a second-stage payload, though their exact function is obscured by obfuscation. The document body contains garbled text, suggesting it is not intended for direct user interaction but rather to facilitate the exploit.

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` `228a94cf139d9aa62ac97cdcba996edda3286e0c0a95d6dae2751fc24978a165`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	27429 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `5d513bdf51822209295f4376c65a423ef38c3f5851ccefc2f85331ce5b4cead1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1056D	27437 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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