PDF malware analysis — malicious · 4bc4608739ae6087

MALICIOUS

PDF

69.8 KB

MD5: ea8d2427b2597e96a7412fc0b96ff953 SHA-1: f8e519b2d1c95cf0023d7829dae6cef060f134b7 SHA-256: 4bc4608739ae6087e15dbd5eeec2b32ed29bf3f325100d93c545b7c9b49fb3f7

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. ClamAV detections on the main file and an extracted JavaScript artifact (legacy_pdfkit_stage_000.js) further confirm its malicious nature, identifying it as Win.Trojan.Agent-36170 and Js.Exploit.Shellcode-18. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the ClamAV detections.

Heuristics 8

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `df400ee77dec8ff4e57c68a8748d395b99661ea2ac4c4d1d1dd7c3ef25a8a16f`	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` `b3946b2ddc63088c6f3dd2475defc6cbc67da06b3edc138ef80f0c2c1cfe81dc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x89E	4596 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).

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