Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de0efdf13825201…

MALICIOUS

PDF

615.6 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)
MD5: 3e4d29fad17f0decd45a539964a6d54d SHA-1: a12350b1d119bda2a7597b3a2f4836dc1ec8a14b SHA-256: 0de0efdf138252013cb1d011e24521f63969536b7beb106ce2fee877273660ac
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains obfuscated JavaScript that utilizes `unescape()` and `String.fromCharCode()` functions, indicative of exploit code. The ML classifier strongly flagged this PDF as malicious. The JavaScript is designed to download and execute a second-stage payload, likely leveraging a known PDF vulnerability for client execution. The presence of JavaScript and exploit indicators points to a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9697

Heuristics 8

  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0161_001.js
5c90edc38323aeba9b2a7857d4bbe58cebe3fcdb0b7f71111049d1cab06c8edd		 pdf-javascript-stream PDF /JS object 161 at offset 0x4BFBB 10923 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
icc_00_off00042dd9.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x42DD9 3144 bytes
font_00_sfnt_off00004e2c.bin
5f96e1e90c4ef56487c91d02c05141dca0967f8e2bbd5d67be6c4f381f0afa79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E2C 62160 bytes
font_01_sfnt_off0000e282.bin
b661c2e877dd6b7625208ae148d736aedb24eda2d4f014262cbb7f958f538ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 71216 bytes
font_02_sfnt_off0001b2dd.bin
8b62f203a4ab5c2ac76368029c584b4fa12fffc17f3b6e4e43a9997416807d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2DD 11156 bytes
font_03_sfnt_off0001d28e.bin
d375c22ace40f0b973d7308d85023b2e0e49d40dc51da45552d116868346475e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D28E 37232 bytes
font_04_sfnt_off000240e5.bin
afeb9e1e920aae3aca3f295f1bbccba46b16423dac14b1b5fde4b661de9198cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x240E5 46764 bytes
font_05_sfnt_off0002c960.bin
95592346b00d039686aa3d7e22eae3d52b011e7e842a5c123f73e89ea766cd35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C960 22628 bytes
font_06_sfnt_off00038a0b.bin
6cf6df6beee88aa138f821122d0c1969b348cebe09cafe5b5f6a7eb8c27107a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x38A0B 32640 bytes

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