PDF malware analysis — malicious · 1f441372c968a3fb

MALICIOUS

PDF

114.2 KB Created: 2010-11-12 16:05:24 +08:00 Authoring application: Acrobat 编辑器 9.0 (via Adobe Acrobat 9.3.4)

MD5: 77bba84be5487a63a2a6f0ad7abc0c98 SHA-1: 0a2862e38c77285a3ff98934a52346f166fb4f75 SHA-256: 1f441372c968a3fb77e725cd36e09066b82a97dadd5e2aa14f86ad287e363da3

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded Flash content (StagePlayer.swf) and a JavaScript stream (javascript_obj0026_000.js), both flagged as suspicious. ClamAV detected the file as Win.Trojan.Agent-36159, and also flagged the extracted JavaScript artifact. The presence of these embedded objects and the ClamAV detection strongly suggest the PDF is designed to exploit vulnerabilities and download a secondary payload.

Heuristics 8

ClamAV: Win.Trojan.Agent-36159 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36159
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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`StagePlayer.swf` `1c251178fe788dc013d63f201f21916bc41a67127b215831b87bb8f4a258cb86`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x996E	70468 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0026_000.js` `6cf67df3f5882433ad14f76cb0f05380548a4feed2fa38a9732a6b229aa5878c`	pdf-javascript-stream	PDF /JS object 26 at offset 0x1B223	2609 bytes
Detection ClamAV: Win.Trojan.Agent-36159 Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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