PDF malware analysis — malicious · 7b35a0e8e42c4d94

MALICIOUS

PDF

5.7 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: 01e0950cac9b9316478cf7cff65f3aa1 SHA-1: 78d52b4a2f592b5001f952681f20e08cd7c173dd SHA-256: 7b35a0e8e42c4d94ea2c765d2970d55ea610c55d202f71852ec0e43e4ee43f39

298 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF file is malicious, as indicated by ClamAV detection (Pdf.Exploit.Agent-35931) and multiple critical heuristic firings. The heuristics point to exploitation of CVE-2009-0927 and CVE-2007-5659 via embedded JavaScript. The JavaScript, specifically the deobfuscated stream legacy_pdfkit_stage_000.js, likely downloads and executes a second-stage payload. The PDF launcher concatenates info fields, extracts characters at a fixed stride, and evals the result, which is a common technique for obfuscating exploit code.

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)
ClamAV: Pdf.Exploit.Agent-35931 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35931
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.
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.
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_obj0006_000.js` `61983b5b550e414f079ddf96a61634d2ebe9e7f6794fce6c388180dcb04ed3cd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1315	671 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `f178a43d5e67862b9c2624abfb66285b5287ecc173c37c43cd0d2fa1bbbca5c5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x16E	4825 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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