PDF malware analysis — malicious · ed9ac30822e6aa99

MALICIOUS

PDF

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

MD5: 1eb23354fa62b3acde2b3932bffeb54d SHA-1: 1d47b45377895a52df2d3b2f4aa55682c0f488f3 SHA-256: ed9ac30822e6aa99d4f26ec5af95922bc06dda432ee12cd84e79c3b0e536451b

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample was flagged as malicious by ClamAV and an ML classifier, indicating it contains an exploit. Heuristics indicate the presence of JavaScript with eval() calls, suggesting the execution of obfuscated code. The embedded JavaScript streams are likely responsible for downloading and executing a secondary payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The reconstructed string 'eval(tts'+vttv+'dff[jio'+vttv+'ol])' points to the use of JavaScript's eval function for code execution.

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` `90ccb710f0aaae4faa2cba4b843d1e283f29430237767829914f6ee4fde77fc7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13563 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0013_001.js` `cb236486391ed235c543adb551945ed89d35851fc94da48eb9199e7e0a118f02`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14269 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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