PDF malware analysis — malicious · 0af56ca8d9a4598f

MALICIOUS

PDF

14.9 KB

MD5: f1e5e3de9d84f6595311daac9b4b0087 SHA-1: 499a19c847817f1ff9588daa81dfe9bd88fa778b SHA-256: 0af56ca8d9a4598f6ad3d288782beb7f8753495e274d15a0b9912a81000c2a04

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_EXPLOIT_CLUSTER'. The critical 'PDF_UNESCAPE' firing suggests the JavaScript is deobfuscated to perform malicious actions. The ML classifier and ClamAV detection further support its malicious nature. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as is common in PDF-based exploits.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 6

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.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0006_000.js` `bb77cd6c5244ade1f52636c0fcc4ef967fb33ad22b282d8b78f6d0b902b0d2b7`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1A5	15716 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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