PDF malware analysis — malicious · dce52b3e9f4befe7

MALICIOUS

PDF

20.6 KB Created: 2009-09-30 19:49:51 Authoring application: PDF Library 4.8.10 (via PDF Library 1.3.5)

MD5: 15bc93b4dddf8a142be3ed64596d2ca7 SHA-1: 2baaf9eea6d92df8fbcfe4bd4a0a67e7d7ac2a6f SHA-256: dce52b3e9f4befe7cacde9792ac0bdeddf90a68745601a3af886e0fc95311c2b

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream is obfuscated, as suggested by PDF_UNESCAPE and EXTRACTED_FILE_STATIC_TRIAGE. The ML classifier strongly flags this PDF as malicious. The primary function appears to be the execution of this obfuscated JavaScript, which is likely designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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
Suspicious extracted artifact medium 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.
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `588aa8e9fa2cce3ed3268f5ce55a9b12e51ebe36287958f5534fefd45dc80921`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	22513 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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