PDF malware analysis — malicious · 0ba7c7a42b9ee42a

MALICIOUS

PDF

45.0 KB

MD5: b0e5fae934a4bdf6bf96c2493d76cea8 SHA-1: 977f8ad45af2d529c8b0fc315f7f3deaec1fe755 SHA-256: 0ba7c7a42b9ee42a41266dac2e0981cb0162bf3423f3a43f69d4e74ef00f795d

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is identified as malicious by ClamAV and a machine learning classifier, indicating it exploits a known PDF vulnerability. Embedded JavaScript streams were extracted, which are heavily obfuscated but appear to be designed to execute code. The primary function of the script is likely to download and execute a second-stage payload, as suggested by the exploit detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `1919d1a4bf04d8cfa87a33a9bb60f2df06093c4f1e50056c2dd48621a6970570`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	45305 bytes
`javascript_obj0008_001.js` `9e0d16d2de9ce86180a62d9c444ca2221ded3c777f99f75e9a6bd1aad42691a6`	pdf-javascript-stream	PDF /JS object 8 at offset 0x20A	45555 bytes
Detection ClamAV: Pdf.Exploit.Agent-36128 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `57967946a3a13ecec732d905ef52cf1073360eee8ce36a404a4bd4e82df7eeab`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x1E7	33047 bytes

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