PDF malware analysis — malicious · 9967fa9e62282dbf

MALICIOUS

PDF

29.8 KB

MD5: f6312ea3373f04bb9ffd8f3589ba6beb SHA-1: bda6383d7d79cffe8ba1ea5eac61e97fc7173879 SHA-256: 9967fa9e62282dbf746eefd4bec02e1c0fe43857e74addede32a227e5ab38fe6

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript, embedded files, and rich media content, strongly indicating malicious intent. Specifically, the presence of an embedded SWF file and a JavaScript stream, along with the use of unescape() in the JavaScript, suggests an attempt to execute arbitrary code. The ML classifier's high confidence score further supports this assessment. The embedded artifacts, 'hJzrcNRhacMbB.swf' and 'javascript_obj0006_000.js', are key indicators of the attack vector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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
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
`hJzrcNRhacMbB.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xC0E	26993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `f8acb7b6d45e02508b68347f6e42447007b6290569d40e172acbd669197b5584`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	1980 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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