PDF malware analysis — malicious · 5738dff3cf88b896

MALICIOUS

PDF

7.9 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 38b7f596b1935385799ad76b21e11ca6 SHA-1: 03eb233209ebd572bfabb5c0c717c69038e69c9e SHA-256: 5738dff3cf88b896ad44cc060d2f36e2729633d847622b0328e5e47784833d82

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file exhibits malicious behavior through embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and a critical PDF_EVAL call. The ClamAV detection of 'Pdf.Exploit.Agent-35587' further confirms its malicious nature. The obfuscated JavaScript, particularly the eval() calls, suggests an attempt to download and execute a second-stage payload. The reconstructed string 'Math.ceil(AGYObnKG7C/W0HNeIcRSex0r' from the DOC BODY points to complex obfuscation techniques used within the script.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35587 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://phpnet.us/byet300x250.php
- http://ad.foxnetworks.com/st?ad_type=pop&ad_size=0x0&section=204717&banned_pop_types=28&pop_times=5&pop_frequency=86400

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `a8f5608ba6f1cb81900902d0941a5da5966c697347030f012155d759d9971abc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D8	5753 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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