PDF malware analysis — malicious · e7988ca139d77f66

MALICIOUS

PDF

1.95 MB

MD5: 2f76d45337a683bc0fe153f379c94210 SHA-1: 1f0f5e6a89be134b03506449c5e78fb26077b474 SHA-256: e7988ca139d77f6672eaf3a2e9b651c019c9c26f148b851c7f7f4200b59b2052

378 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains multiple critical heuristic firings indicating exploitation of known PDF vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, through embedded and obfuscated JavaScript. ClamAV detections further confirm its malicious nature. The embedded JavaScript, though obfuscated, is designed to execute further stages, likely downloading and running additional malware. The presence of multiple embedded PDFs and JavaScript files suggests a multi-stage attack.

Heuristics 9

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)
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `657ec08f5cf38137b2fc3220a8f12a2dc2d26a2792bd0dec7d18d531770f6b7f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1512 bytes
`legacy_pdfkit_stage_000.js` `d8f40c6c4e1baca5c3eaf545b16ed695eddef38c348702900e4231c1b804cf38`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x803	4597 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`javascript_obj0008_000_1.js` `fa1079d2fd3ff89707e15310ecaf2d9a22d6629b8dc5f896db6b1111bd709569`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1629 bytes
`legacy_pdfkit_stage_000_1.js` `daae90e2942a4b3134ed63c80561dbbf40944f38c696d9d6efcde48617f8f3d5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x878	1269 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`polyglot_child_pdf_off00011680.pdf` `ede0eff756014e373556bf62677e278b0b87c883cada283d6c38f0b2982a1d95`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x11680	1976704 bytes
Detection ClamAV: Heuristics.PDF.ObfuscatedNameObject Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`polyglot_child_pdf_off00016a75.pdf` `02a8eb5a6dd7396bed7e644eeda84b2f6fbdefdbe6436832b9c918367226d51c`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x16A75	1955211 bytes
Detection ClamAV: Heuristics.PDF.ObfuscatedNameObject Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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