PDF malware analysis — malicious · d06fbc1bd7772a4d

MALICIOUS

PDF

12.9 KB

MD5: 2a5b7eb7b3ad74d425e7e4220b0c4dfc SHA-1: df6122048f0ca05410ed60fe9a15573ab33c3270 SHA-256: d06fbc1bd7772a4d34447f6ea603a94a5cc2c83225e889bba04e5c1ba2f511f3

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated using binary-XOR encoding. Critical heuristics indicate this JavaScript exploits CVE-2007-5659 (Collab.collectEmailInfo) to achieve code execution. The recovered JavaScript is a stager that likely downloads and executes a second-stage payload, as suggested by the 'Pdf.Dropper.Agent' ClamAV detection.

Heuristics 7

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.Dropper.Agent-7306621-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7306621-0
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
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_obj0049_000.js` `f76555b687de8cb1fb6f603a1bcf7e0602a8affa2b90acc6912041a925a8d230`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	76540 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `ec7dedc812f83ad6ad4c92f79a40f095c992f5cb08ed4ef09f7fce9978699c51`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1270 bytes

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