PDF malware analysis — malicious · e5fe63aee0331a32

MALICIOUS

PDF

229.0 KB

MD5: d9a15e4d6f52d5e4581790604feb43e5 SHA-1: 8f50e9a9c2236e0192f77cef1339a48b04acc014 SHA-256: e5fe63aee0331a3259f8bfedcc3801142ede4d8495854ec2b08bf7d7e81b05f9

258 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities in Adobe Reader, specifically targeting Collab.getIcon, Collab.collectEmailInfo, and util.printf functions. The embedded JavaScript is further deobfuscated and identified as a malicious shellcode dropper by ClamAV. The primary intent appears to be the execution of a second-stage payload via the exploited vulnerabilities.

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` `e1b9b3bb2662fea50f31f28799d59ba93d702e158ba095687383ba73cd00c8f9`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3399 bytes
`legacy_pdfkit_stage_000.js` `a35a4177fa97bc50df2dd8524228b15f5252bc462b91b85a03fdc2a497e6cf1f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xF62	10967 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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