Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4d3ae74ce1b0e1…

MALICIOUS

PDF

1.95 MB
MD5: 73cc3b3386205bfb760cb3863b77431e SHA-1: bbb647d1dbb82437d66bb185332163e2eef006cc SHA-256: bc4d3ae74ce1b0e1dc39bc5b0bea26f0f7369b6d27408f681a72f3f846994fc8
214 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. Static analysis identified a secondary embedded PDF with suspicious findings, including JavaScript and obfuscation. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further indicates malicious intent. The primary attack pattern involves luring the user to open the PDF, which then triggers the execution of the embedded JavaScript, leading to the loading of the secondary malicious PDF.

Heuristics 8

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0004_000.js
be7f5eaa31879a245b9c8a3d48e82cd2cdec4706a9c7b40e9f418d4a1872c7f3		 pdf-javascript-stream PDF /JS object 4 at offset 0x75 10763 bytes
javascript_obj0014_001.js
b53ac129acfd382e4ae6a4c51f238b86e1d60e6b741a99651705fffcaca1ef03		 pdf-javascript-stream PDF /JS object 14 at offset 0x1A0C 111 bytes
polyglot_child_pdf_off000071b9.pdf
f87cdb8b88e0c34b1c6acb32c17676613e47cbfc7f0983275ab77239af4e9241		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x71B9 2018887 bytes
Detection
ClamAV: Heuristics.PDF.ObfuscatedNameObject
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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