Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80fde0c44a94f39…

MALICIOUS

PDF

2.12 MB Created: 2009-12-16 20:32:53 +08:00
MD5: 41edac0cf7197ed5b39289a436037d5e SHA-1: b7e21e1d7f58574c32e373981ebf228fa0dc1329 SHA-256: d80fde0c44a94f39a112e67b10286f0d07182ea9d25977904be5ca8b4f9222b5
68 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicated by the PDF_JS and PDF_JAVASCRIPT heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a second-stage payload. The presence of an embedded file and the 'eval()' call in the JavaScript stream are strong indicators of malicious intent. The document body was not parsable, so the rationale is based on the script and PDF structure.

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000322.js
625088f7c9b6ff506705cde839fbd462635503151e0d3c7d2502a7e484d9ddf1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x322 11423 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0021_00.bin
695d02880cca0e7681b511549b1055f43e105b218407918dc0707063b7975e04		 pdf-objstm-decoded PDF /ObjStm 21 0 obj (inflated) 330 bytes

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