PDF malware analysis — malicious · ae88ac5bd1a48b5a

MALICIOUS

PDF

8.2 KB

MD5: ebe2a74bff9644971beb8633b8660580 SHA-1: f5dbaf4a0a1c6f199229411294675f68b6bb7387 SHA-256: ae88ac5bd1a48b5a17c7898596adc661e8134c313591be876c49de688df7669f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), indicating an attempt to hide malicious code execution. The ML classifier also strongly flagged this PDF as malicious. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL or execution method is obfuscated within the script.

Machine Learning

Nyx PDF Classifier malicious score 0.9164

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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)
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000032d.bin` `b0a4ca3fb9cc95951d0237961db0b3a68980a13b3e4f605282cc5a67126415a0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32D	2984 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_003_off00000b33.js` `72976bee7b057c9d715415314d451ee25a9862b4b3f68da1b805b85fdca17bf5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB33	366 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`objstm_0025_00.bin` `ebb8e44eabc7278eed4d101d0c6ae869c0f41a41d73041e0d0255184870950d4`	pdf-objstm-decoded	PDF /ObjStm 25 0 obj (inflated)	425 bytes

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