PDF malware analysis — malicious · 0161d52dad6fc0a5

MALICIOUS

PDF

28.0 KB

MD5: 12b4df6f1031efb42a8a5c56470a9b57 SHA-1: a1b7fec5d6fb8ddf501e6f4f4f5eae9c01873f06 SHA-256: 0161d52dad6fc0a503e8c1b73b69fae20923ff864130d955a562f09c02016fff

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes an eval() call, a common technique for executing obfuscated code. The script reconstructs the string 'var var_uni = unescape;' and then calls a function 'valtozo_uni' with the argument 'aasdads', which likely leads to the execution of further malicious code. The presence of a SWF file and ML classification further indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
RichMedia (Flash) high PDF_RICHMEDIA

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

eval() found — commonly used for obfuscated exploit execution
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
`waEUHOXaQoR.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x4D2	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` `6f835a788990b79d6ef891faba34c9d619dae84bde05250401a8648b4174037c`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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