PDF malware analysis — malicious · e4f5e678ba353bfb

MALICIOUS

PDF

13.0 KB

MD5: 38915e76df3d03488a2ee5395968250e SHA-1: 6772903f20acfbe893fd0e9304e83a2b87f150d7 SHA-256: e4f5e678ba353bfb599996dd6e2d63da47f80ccc4694524e69d0b3bcad67595c

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 is XOR-encoded and uses String.fromCharCode. Heuristics indicate this JavaScript is a stager designed to exploit CVE-2007-5659 (Collab.collectEmailInfo). The stager likely downloads and executes a second-stage payload. The presence of PDF-specific JavaScript actions and obfuscation techniques strongly suggests malicious intent.

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` `5b9f91111dc20b12469ff75853aed8b03eeddc390562f18014d6bc2b062d90e1`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	76936 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` `7a46468be9640c6c1267314496226c79be23fde5385d4c048846e3a61dc32822`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1276 bytes

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