Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3a46ed4f7da2f7…

MALICIOUS

PDF

275.1 KB Created: 2010-04-21 00:46:53 +08:00
MD5: 893625ca6295c9761af897153de0c43f SHA-1: 501e97be788e85842c095bb88333b93c958095cd SHA-256: ce3a46ed4f7da2f73bc654cffe6da99e60930ef212475e31c2e137cae38dbad1
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The embedded JavaScript stream, named 'stream_012_off000434ad.js', is highly suspicious and likely responsible for executing malicious code. The presence of PDF_RICHMEDIA and PDF_IMAGE_ONLY_LURE suggests an attempt to disguise or lure the user into interacting with the malicious content. The ClamAV detection 'Pdf.Exploit.Agent-35956' further confirms its malicious nature. The primary attack pattern involves exploiting a PDF vulnerability to run this script, which is expected to download and execute a second-stage payload.

Heuristics 9

  • ClamAV: Pdf.Exploit.Agent-35956 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35956
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_012_off000434ad.js
a8e9a031915fc297bf10a6ec84576b5b55a9de0263ee4db0e5604573a17731a2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x434AD 9494 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0015_00.bin
0bea2f3f6742827130b057b701b07bdcb51c89b49c3509980c44a0392473f8fb		 pdf-objstm-decoded PDF /ObjStm 15 0 obj (inflated) 888 bytes
objstm_0043_00.bin
34adfa579a1db11b7419ab08cf86866f8443676d947c2196bbfc0c97edf23a79		 pdf-objstm-decoded PDF /ObjStm 43 0 obj (inflated) 32 bytes
objstm_0048_00.bin
950f1bd1fbb167275a774acfa49d579367ba1b22fa7f54188161bf0439584559		 pdf-objstm-decoded PDF /ObjStm 48 0 obj (inflated) 32 bytes

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