PDF malware analysis — malicious · 4a7d5ea3afbc38c0

MALICIOUS

PDF

14.6 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 246f5a373c45736281c00646a70b2596 SHA-1: 2a3f3066bea7f43d37c0d402c15a0cf0b082ef26 SHA-256: 4a7d5ea3afbc38c0bad14bda78360ba10f31b9cd3e297c8d1c50c4b9e499a0bf

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript with multiple obfuscation techniques, including string concatenation and eval() calls. Heuristics indicate JavaScript actions and eval() usage, strongly suggesting the execution of malicious code. The ML classifier and ClamAV detection confirm the malicious nature. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and run a second-stage payload, as indicated by the 'eval(tts dff[jio ol])' string.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36118 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36118
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.
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.
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
`javascript_obj0013_000.js` `3378ec44803d4753f5eae5881abf5c84184b1044e21ba789b4b64827ce4ccd9f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13354 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 25 long base64-like blob(s).
`javascript_obj0013_001.js` `d967bef5a1f8a0d17271ddd4d6a3c347a67d014d8e561d2aa98bdd0b0f832d93`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14060 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 25 long base64-like blob(s).

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