PDF / .TXT malware analysis — malicious · a4e1ba46f1d54b23

MALICIOUS

PDF / .TXT

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

MD5: 55bc1b73575fe72aa6c291ba4b1a2786 SHA-1: 05bc0850bcc3eb3991d5e4a822bad0f52ed617a6 SHA-256: a4e1ba46f1d54b23b234e2f7fd02965014d4446b4afd76138ea820a97af54465

298 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The sample is a PDF file that exploits known vulnerabilities (CVE-2009-0927 and CVE-2007-5659) through embedded JavaScript. The JavaScript is obfuscated and uses eval() to execute, indicating it's designed to download and run a secondary payload. ClamAV detections further confirm its malicious nature. The document body is unreadable due to encoding, but the heuristics and extracted artifacts strongly suggest a typical exploit PDF.

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: Pdf.Exploit.Agent-35931 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35931
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.
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_obj0006_000.js` `75aa9443c83975dff215eccf5813f05d67e62f743d19c4488daf6ce941ba5d16`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1336	815 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` `feb387c5084510bd2d10b94881284873e2422cd26dbd3cc70be41cbe9a0ed17e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x16E	4879 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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