PDF malware analysis — malicious · 50ef07f6f72e5023

MALICIOUS

PDF

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

MD5: ded2abab925297746149555045c5452a SHA-1: 8b5b88b3ffc5e2c035676d14adfd0b05875e5564 SHA-256: 50ef07f6f72e5023becd0c9187890cbc6e12e759000fcf1d654297bad96744bf

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript with multiple 'eval()' calls, indicating obfuscated code execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript likely attempts to download and execute a second-stage payload, as suggested by the 'eval()' usage and the presence of extracted JavaScript files. The reconstructed string 'eval(tts\"dff[jio\"ol])' is a key indicator of this malicious behavior.

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` `043dc81e960b5909e109579865775fb05de5e92b802d3d90089fb48008360e01`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13472 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj0013_001.js` `e524e4f17eb29569a5f0b0e75f473f2c4cbc3ee6abae6bc5d8ca5f460d027d91`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14178 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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