Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0aff5cf1c9fd39…

MALICIOUS

PDF

127.4 KB Created: 2008-03-03 17:06:20 +08:00 Authoring application: Advanced PDF Repair: http://www.pdf-repair.com
MD5: 2eba76eeec3bbf36d34ca91732d419e4 SHA-1: 74fe5d3518ce6691176bf0b381c09d71ffaae6b0 SHA-256: ad0aff5cf1c9fd398c4f2cbfe0f722fa537771a334973584409ec58d9d2ae65e
134 Risk Score

Malware Insights

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

The PDF file contains obfuscated JavaScript, indicated by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL' heuristics, along with a critical ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject'. The embedded JavaScript stream 'stream_008_off0001e2bf.js' is highly suspicious and likely responsible for executing malicious code. The primary attack pattern involves leveraging this script to download and execute a secondary payload, a common technique for malware delivery.

Heuristics 8

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.pdf-repair.com
    • http://www.pdf-repair.com)/Producer(Advanced
    • http://www.pdf-repair.com)/ModDate(D:20100404092506+08
    • http://www.pdf-repair.com)/ModDate(D:20100404093132+08
    • http://www.pdf-repair.com)/ModDate(D:20100404093243+08
    • http://www.pdf-repair.com)/ModDate(D:20100404093525+08
    • http://www.pdf-repair.com)/ModDate(D:20100404093601+08
    • http://www.pdf-repair.com)/ModDate(D:20100404094947+08
    • http://www.pdf-repair.com)/ModDate(D:20100404095117+08
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001e2bf.js
2fe85b93fb9b41eb8a33b9e59056e1b5da436c9a40c19deb91141a24d573bd72		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E2BF 18211 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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