PDF malware analysis — malicious · 77f1ca442ccabea0

MALICIOUS

PDF

10.6 KB

MD5: babf9cceb24d0ae7eb70ed6744220964 SHA-1: 9cf207cd303e1652ba35fa733c02b1213bcacc3d SHA-256: 77f1ca442ccabea06e8527753732a863b1e58f93845d3fae4d9a57c118997914

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier and contained embedded JavaScript. The JavaScript stream, identified as 'javascript_obj0007_000.js', was obfuscated and utilized an unescape function, indicating a high likelihood of malicious intent. This script is presumed to download and execute a second-stage payload, aligning with common PDF-based malware delivery techniques.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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_obj0007_000.js` `5366c5602729cb634f5bf116e4469380dd078e3af57ad0c1fb30f5201a8a7ba0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	47260 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 241 eval/decoder/string-building token(s).

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