PDF malware analysis — malicious · ed0df35ccf9e6dc0

MALICIOUS

PDF

37.7 KB

MD5: f3aa056e83e13beb7784e3a1a733cbd0 SHA-1: 133bc080ee1f5a4d17dc1fed88d7888878b44960 SHA-256: ed0df35ccf9e6dc0479c81a738ecfbf21baef74a62dc7bac81ac9dca8e3136b6

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript and Flash content. The presence of JavaScript actions and embedded files, combined with the ML classification, strongly suggests malicious intent. The embedded JavaScript file, 'javascript_obj0006_000.js', is a primary indicator of compromise. The exact functionality of the script is not fully discernible due to potential obfuscation, but its presence within a malicious PDF points towards a delivery mechanism for further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`Adobe.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAE1	55839 bytes
`javascript_obj0006_000.js` `9eccd2177bf81c78c6a138c04a281fd903037eedebc849c4a7fa72b85e67facd`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1612 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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