PDF malware analysis — malicious · 305a4d0c9a7bc8b2

MALICIOUS

PDF

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

MD5: 59cb2175a03239d5dc452d20337574e0 SHA-1: 4aea1c7a7709470b3fdc4b5866c8a1afe0115a81 SHA-256: 305a4d0c9a7bc8b233868436d71b0e8a3dbbf2733881ca91e9f496df7f114b6f

246 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages known vulnerabilities (CVE-2009-0927 and CVE-2007-5659) to execute code. The 'eval()' call and 'String.fromCharCode' usage indicate obfuscated JavaScript execution. An extracted artifact, 'Js.Exploit.Shellcode-18', further suggests exploit activity. The primary intent appears to be the execution of a secondary payload, as indicated by the exploit signatures.

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 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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `0861fbeba52cb3deeb4c593adec37b174847e1a9d466b77a4cfc227b381b1fd8`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1354	300 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` `10ea857930977a909753cfe8125a4d7387d02d79141dac31e01c8d3ccb84bfca`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x192	4735 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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