PDF malware analysis — malicious · 92f3b94bcc7c7b0b

MALICIOUS

PDF

250.1 KB

MD5: e48ef375c93cda636d1996aa692781e9 SHA-1: 0fd7a0ede07c41f3b0538f756093ecb4a6025972 SHA-256: 92f3b94bcc7c7b0b20c85ad75e9f99f7a8bfeb7a9297118302a51f15ca4042e8

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. The JavaScript action and embedded JS stream suggest the execution of malicious code. An extracted artifact, legacy_pdfkit_stage_000.js, was flagged by ClamAV as Js.Exploit.Shellcode-18, indicating it likely downloads and executes a second-stage payload. The PDF launcher concatenates info fields and extracts characters at a fixed stride to evaluate the result, a common technique for obfuscating exploit code.

Heuristics 7

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 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` `b754d1d3e04a7cd4e4bfffb795d24b52f0ddc3afda28f0c5d433c1f4565953e6`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3415 bytes
`legacy_pdfkit_stage_000.js` `b76fddf5486abba5ee5966b3939234932c628394ccea35132aa403b5d8ea765b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xF72	8394 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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