PDF malware analysis — malicious · 19c70d5b5f15f387

MALICIOUS

PDF

74.5 KB

MD5: 86d770c539f6449bb6d00996b11935f1 SHA-1: ecc4beacb2cdd639d622c7c100e262e881c7fbde SHA-256: 19c70d5b5f15f387b9bd1263e74b01346e7eaf720dadd2b545dcb3071b02e58f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated using binary XOR encoding. This script is designed to exploit CVE-2007-5659 in Adobe Reader, specifically targeting the Collab.collectEmailInfo function. The exploit stage is then executed, likely to download and run a second-stage payload. The presence of multiple JavaScript-related heuristics and the specific CVE firing strongly indicate this attack vector.

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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_obj0004_000.js` `5a7bf326f9e9ab6e708c709bb2a928b8b748b6b800fab044f1a5a1563baacc36`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	75994 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `7c838c8c6e50294331de6b4fbbfe3ea7c3c195c087e7dcd8fb9c58179fae563c`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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