Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1771e94d1d3fe63…

MALICIOUS

PDF

22.4 KB
MD5: bacb87562ed1743c45affce012b347fd SHA-1: cc9e436615ba0c22994a2cf91c70e23266255c23 SHA-256: e1771e94d1d3fe631333490b46ab4691816b5a40572bcefb59069d4935319e39
198 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates exploitation of a known PDF vulnerability to execute this JavaScript. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the ClamAV detection of 'Win.Trojan.Agent-36170' on the file and an extracted artifact. The document body content is obfuscated and does not provide clear user-facing lures.

Heuristics 6

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • ClamAV: Win.Trojan.Agent-36170 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36170
  • 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.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
a564fa74d4ced2dba9b0e18092a5e212a0aa213162210a91e15d5f94d3da3742		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 1667 bytes
Detection
ClamAV: Win.Trojan.Agent-36170
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
0546aa2685b54b9a8397456b83a192117de3b1ca961009eef3f358c932d54be8		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x89E 1362 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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