Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b51c5a606a585b…

MALICIOUS

PDF

102.6 KB Created: 2009-08-11 12:43:52 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)
MD5: 66d41f3bc4af53fd2cd3bde63d9096a4 SHA-1: f342ee209f0d617715c675cfe3944077ba07ee31 SHA-256: a6b51c5a606a585b3c04aa089be7d597c6c893e772a741495e6f0664de151de3
122 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The critical ClamAV detection of 'Pdf.Exploit.Agent-22553' strongly suggests a known exploit. The presence of JavaScript, particularly with the unescape() call, points to an attempt to obfuscate malicious code that likely downloads and executes a second-stage payload. The document body is image-only, a common lure technique.

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-22553 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-22553
  • 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.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0062_000.js
7a7f729314a884be5721afd603eb4e5c9cb27fac2daf1b23e1dc1b27885489ee		 pdf-javascript-stream PDF /JS object 62 at offset 0x12770 52550 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0063_001.js
ac5ff3469c8a351159f1f00a4ddbffeeb221c6d3eaaf209c9f1b761be926a942		 pdf-javascript-stream PDF /JS object 63 at offset 0x17CBA 13445 bytes
javascript_obj0064_002.js
0d1e63906f3fce6f010a40426f28218d79a47a7f50baa2e3dc0cff8a5806e280		 pdf-javascript-stream PDF /JS object 64 at offset 0x1909E 57 bytes
javascript_obj0065_003.js
2277a2143f04904a5f851534fc5f4b15feffacc40d85d044cc2748a8651d0621		 pdf-javascript-stream PDF /JS object 65 at offset 0x1911B 80 bytes

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