Malicious PDF — malware analysis report

Static analysis result for SHA-256 c657c551ea632598…

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: 746282b3f9e6a4853a57ce64859f4adc SHA-1: af060aad44b34dece6f479b0726faf840a5bbdfa SHA-256: c657c551ea6325981f17bd8670bd5cbfbe616968a0856e8aa5fc10ba24fe5767
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The sample is a PDF file detected as malicious by ClamAV (Pdf.Exploit.Agent-35587). It contains embedded JavaScript with eval() calls, indicating an attempt to obfuscate malicious code. The script likely downloads and executes a second-stage payload from one of the embedded URLs. The obfuscated nature of the script and the use of eval() suggest a downloader or exploit delivery mechanism.

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.

FilenameKindSourceSize
javascript_obj0013_001.js
bc391ed407881e23399688dbe37e473c5f816d56cbbb5e5f1b01bd6cff2464b7		 pdf-javascript-stream PDF /JS object 13 at offset 0x3D8 5792 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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