PDF malware analysis — malicious · f46b1096f4cbb96f

MALICIOUS

PDF

13.3 KB

MD5: d0a21f9314abd176d8bf90d9dd3eff6f SHA-1: 91a67d8d5b38b0826aceaf777feadd30e583fda7 SHA-256: f46b1096f4cbb96facc89e2acae0a899f2aa3e59f29cba237ebb0e1dfeda27d0

186 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript that utilizes a binary-XOR stager to exploit CVE-2007-5659 in Adobe Reader. This exploit is designed to download and execute a second-stage payload. The presence of the Collab.collectEmailInfo function and the binary-XOR decoding strongly indicate a targeted exploit delivery mechanism.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `5f1976d47fcb1d3b08cbb104e4544c0c80e09b86c4c81eb9262d0b5c2b9124a6`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78844 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` `c1d0b40f07e054d1db24581f00b7eeec28d48f6fbe241be1cc149f33d34baa19`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1318 bytes

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