Malicious PDF — malware analysis report

Static analysis result for SHA-256 612d942adcbf7cf5…

MALICIOUS

PDF

502.7 KB Created: 2008-09-07 22:47:39 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12; modified using iText 2.1.7 by 1T3XT)
MD5: 8cb964ab5d51e3503ca7559842a6b8f0 SHA-1: 288ff3d0e8ad4a9c7b12d72b9d6c08564f594c59 SHA-256: 612d942adcbf7cf509d7bed2ee8167334e70ec93726009896fbc1e8bb4b237cb
238 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is flagged as an exploit cluster and a generic stage recovery. ClamAV identifies the exploit as Pdf.Exploit.CVE_2009_0927-1. The JavaScript appears to be heavily obfuscated, but its presence and the exploit detection strongly suggest it's designed to download and execute a secondary payload. The ML classifier also flagged the PDF as malicious with a high score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9624

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.Exploit.CVE_2009_0927-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.CVE_2009_0927-1
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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://ns.InsiderSoftware.com/fontlist/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://www.iec.ch
    • https://www.verisign.com/rpa
    • http://ocsp.verisign.com/ocsp/status0
    • https://www.verisign.com/rpa0
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
    • http://www.microsoft.com/typography
    • https://www.verisign.com/repository/CPS��
    • https://www.verisign.com
    • https://www.verisign.com/repository/verisignlogo.gif0��
    • https://www.verisign.com/CPS0b
    • http://www.microsoft.com/truetype/0
    • https://www.verisign.com/repository/RPA0
    • https://www.verisign.com/repository/verisignlogo.gif0�
    • https://www.verisign.com/CPS
    • https://www.verisign.com/repository/CPS

Extracted artifacts 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0159_000.js
4a4438aecec7f2b074a73359436e0fb7678e1be2487d6b4ab8a37ee5691a5706		 pdf-javascript-stream PDF /JS object 159 at offset 0x4AF07 4715 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0159_001.js
355d852938d25964e3a7badf8b2b3c4f689f1e9dc3ee0a01d5558515cf53e218		 pdf-javascript-stream PDF /JS object 159 at offset 0x4AF29 207773 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
generic_stage_recovery_000.js
813da5caa9ca847a16f753fe126f89b4bc514fb80c4bd9c7b2a6fa87b01bac66		 deobfuscated-js generic stage recovery percent-decode from combined JavaScript objects at offset 0x4AF07 212473 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
icc_00_off00041d25.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x41D25 3144 bytes
font_00_sfnt_off00003d7a.bin
5f96e1e90c4ef56487c91d02c05141dca0967f8e2bbd5d67be6c4f381f0afa79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3D7A 62160 bytes
font_01_sfnt_off0000d1d0.bin
b661c2e877dd6b7625208ae148d736aedb24eda2d4f014262cbb7f958f538ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 71216 bytes
font_02_sfnt_off0001a22b.bin
8b62f203a4ab5c2ac76368029c584b4fa12fffc17f3b6e4e43a9997416807d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A22B 11156 bytes
font_03_sfnt_off0001c1dc.bin
d375c22ace40f0b973d7308d85023b2e0e49d40dc51da45552d116868346475e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1DC 37232 bytes
font_04_sfnt_off00023033.bin
afeb9e1e920aae3aca3f295f1bbccba46b16423dac14b1b5fde4b661de9198cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23033 46764 bytes
font_05_sfnt_off0002b8ae.bin
95592346b00d039686aa3d7e22eae3d52b011e7e842a5c123f73e89ea766cd35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B8AE 22628 bytes
font_06_sfnt_off00037957.bin
6cf6df6beee88aa138f821122d0c1969b348cebe09cafe5b5f6a7eb8c27107a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x37957 32640 bytes

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