PDF malware analysis — malicious · 29d057437a38255e

MALICIOUS

PDF

43.1 KB

MD5: cd335c698f0b6d4f6ddbc2a98ff1b566 SHA-1: 15e969218dc2f87aaf865db699d6854c372a8de1 SHA-256: 29d057437a38255e95cb8d42ed2601f9f71f342bde3ef5c7532a9018f5506654

102 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample was flagged as malicious by an ML classifier and exhibits several suspicious characteristics including embedded JavaScript, XFA form usage, and ASCIIHexDecode filters. The presence of an embedded JavaScript file (javascript_obj0012_000.js) strongly suggests an attempt to execute arbitrary code. The JavaScript likely attempts to download and execute a secondary payload, which is a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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)
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://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `399a8e573d80bcf022d5560a476687fff05fefef9ef5855b0976bdef4a6720cd`	pdf-javascript-stream	PDF /JS object 12 at offset 0xA0B2	3870 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s). Carved artifact contains 4 long hex-escaped blob(s).
`font_00_sfnt_off0000033c.bin` `26f3e7c91c76e658576c1bbb605ddb8e33e657870ea2f8ad3b8fe8f80b303358`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x33C	65932 bytes

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