PDF malware analysis — malicious · c992d503931d34eb

MALICIOUS

PDF

292.8 KB

MD5: 06c7ae7acdd063f2f58c036ac1b1094b SHA-1: 7293f93452419f6775828f1084daf32fa6c36f33 SHA-256: c992d503931d34ebfc25bdb7438d7f945c79d96bdc49b86ec2a62f31acb4fd4d

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript actions and streams. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript file, 'javascript_obj0008_000.js', is highly suspicious and likely responsible for executing the malicious payload. The exact behavior of the script is not fully detailed, but its presence within a malicious PDF points to a common delivery technique.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `8baf5c3eb9ba3d3b5e93dd4e98263261b920776bb14bec2ba61427d6cbca791c`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99672 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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