Malicious PDF — malware analysis report

Static analysis result for SHA-256 06607a147d773f8d…

MALICIOUS

PDF

129.0 KB Created: 2009-04-28 11:11:11 -04:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0.5 (Windows))
MD5: fc37c944af761c58e742959be93217bd SHA-1: 4be737f23c011dac1ab5933c598f0eab094f5b1b SHA-256: 06607a147d773f8d3a9083f5f0d289979da660ac3a89af334d7e3dcdd9a781a0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that exploits a known vulnerability, likely targeting Adobe Reader. The script is designed to download and execute a Linux bind shell payload on port 4444. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Pdf.Dropper.Agent-7224710-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7224710-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ocsp.verisign.com0
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.iec.ch
    • http://crl.verisign.com/ThawteTimestampingCA.crl0
    • http://crl.verisign.com/tss-ca.crl0
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA2.crl0O
    • http://www.microsoft.com/pki/certs/CodeSignPCA2.crt0
    • http://www.microsoft.com/typography

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0042_000.js
c411ebc5aaa19b586e886307f24405534ef431fe778d465aa3d9fb73cc445a7d		 pdf-javascript-stream PDF /JS object 42 at offset 0x1C84E 1387 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0048_001.js
2da33ef621072a013655318320dc086d16878b137d1d43e26e170420133da980		 pdf-javascript-stream PDF /JS object 48 at offset 0x1F1F1 1008 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
icc_00_off00000716.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x716 3144 bytes
font_00_sfnt_off0000484c.bin
edc419b3abc6247a12553bc2dfa4625dd8e3589ca7970850672f3c7d82eec146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x484C 32224 bytes

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