PDF malware analysis — malicious · c756839b366cabfc

MALICIOUS

PDF

77.0 KB

MD5: b5105c2dbee64725a193df185a567bc2 SHA-1: ba933588dff0f1e73751200db0795fc62368d93d SHA-256: c756839b366cabfc0779d39720d36b1c8358af06dcc19ed462244d6a149e7968

166 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. This script leverages the 'Collab.collectEmailInfo' method, which is known to be vulnerable to CVE-2007-5659 in older versions of Adobe Reader. The script's purpose is to download and execute a second-stage payload. The high confidence is due to the clear exploitation of a known vulnerability and the presence of a stager script.

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` `ba7940fa8797d36bd0e6da1864506cee1d5773a5130fa992853f496d162fe7cd`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	78485 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` `07368f5b562e564e21dbc903b0be0b9d64fb498e5060651d3bed2ca5b0146b35`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x68AE	1285 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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