PDF malware analysis — malicious · b7d55ba1436ee70a

MALICIOUS

PDF

75.0 KB

MD5: e058fa0939931adc2fb3258c1793930e SHA-1: 250f7778e70e656cb8610323cf1cbc70510e32b2 SHA-256: b7d55ba1436ee70a3412baf6b09ec4847ca4b5bc96a7a09a3909fa38155166a5

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that utilizes a binary-XOR stager to decode and execute a second-stage payload. The critical heuristic firing indicates exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method in Adobe Reader. The JavaScript is heavily obfuscated, but the stager is designed to recover and execute further malicious code.

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` `3633adce42075501322f40ca3e886673f9c4e4830ed813b3f9ecb010d63917ff`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	76469 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` `b986ae66ef64e195ac85606527aa04f6663089ba5d90887530553f33981c7eaf`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x660E	1243 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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