Malicious PDF — malware analysis report

Static analysis result for SHA-256 119d26ec79240bd7…

MALICIOUS

PDF

64.9 KB
MD5: 7d4b22dd3b306840d55c9969db86e067 SHA-1: 6e6e83539a48941cfbb1f7840c80675e9da33750 SHA-256: 119d26ec79240bd7348e6cd6b4ad8c490dfd603f1a9f484a13939a7b6029a9ff
174 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS, which is further flagged as a PDF JavaScript exploit cluster. The script attempts to download and execute a second-stage payload, as indicated by the embedded script payload heuristic. The obfuscated JavaScript function 'dec' reconstructs a string that appears to be a URL, which is likely used for the payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9118

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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.
  • 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 script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xci/2.8/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-locale-set/2.7/
    • http://www.xfa.org/schema/xfa-locale-set/2.6/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xfa/promoted-desc/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://cgi.adobe.com/special/acrobat/update
    • http://crl.verisign.com/tss-ca.crl0
    • http://crl.verisign.com/ThawteTimestampingCA.crl0
    • https://www.verisign.com/rpa
    • https://www.verisign.com/rpa01
    • http://crl.verisign.com/pca3.crl0
    • http://CSC3-2004-crl.verisign.com/CSC3-2004.crl0D
    • https://www.verisign.com/rpa0
    • http://CSC3-2004-aia.verisign.com/CSC3-2004-aia.cer0
    • http://www.adobe.com/typehttp://www.adobe.com/type/legal.html

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000034b.js
f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34B 1532 bytes
stream_003_off00000536.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536 870 bytes
embedded_pdf_script_00001fab.bin
30ce21ea1cda0f890aea6e1fb62ad6d22bac2cec62281e587a1efa00b1a2f553		 pdf-embedded-script PDF raw stream script payload at offset 0x1FAB 18125 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0039_00.bin
b5ca42bcbfb65caec0b000957c6ba1becb31aae391b45a4887901396e1ca9495		 pdf-objstm-decoded PDF /ObjStm 39 0 obj (inflated) 1395 bytes
font_00_cff_off00000f20.bin
3c3b0837d4cd89f8e38a421a3682b1b05be54c1f94f589e57f50a253a86e7c22		 pdf-font-stream PDF embedded font (cff) at offset 0xF20 1289 bytes
font_01_sfnt_off00007600.bin
3a47365ba29be93b97be381e34ec3c7ef0a10e0f82cdb3dadd6fb11f2800fdb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7600 36717 bytes

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