PDF malware analysis — malicious · f97d4b87c5aa46ae

MALICIOUS

PDF

6.6 KB

MD5: 04fe13af99b2e26f0481fa496c8bd145 SHA-1: 23643366cd7b6672a99dac3e5dde5b664c4c23dd SHA-256: f97d4b87c5aa46ae2eb4febb92407715aef821d07a268dedd4b005675bb81ea5

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1071.001 Web Protocols T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities including CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. The heuristic firings indicate that this JavaScript is XOR-decoded and then evaluated. An extracted artifact, detected by ClamAV as Js.Exploit.Shellcode-18, suggests the script's purpose is to download and execute a secondary payload. The obfuscated nature of the JavaScript and the use of exploit techniques point towards a malicious downloader.

Heuristics 8

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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 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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `bfddd19ee583f730711b217aed326a91189d99740377791d571dbcd41105aeb4`	pdf-javascript-stream	PDF /JS object 39 at offset 0x16F	20700 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `7b037fa54190e770de0dcf95257be25307cfa7f02f349897a3cc5594440f0b09`	deobfuscated-js	numeric array XOR decoded JavaScript at offset 0x16F	5326 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `db5c1d3958e2b4bba5744133d69607db6a5ba2fb737c60c90a50a046de2b5d8f`	deobfuscated-js	numPages XOR decoded JavaScript at offset 0x16F	5326 bytes

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