PDF malware analysis — malicious · f8bf736e560366d2

MALICIOUS

PDF

13.0 KB

MD5: a01e22213e3ad3ec2f6fb7bb09781110 SHA-1: e1cd5fc09edc6bb29acd2ad6688c6b7b8b1d5aeb SHA-256: f8bf736e560366d285531eb9b3415d72115833f336c4b7a207df473a85a04686

186 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 exploits CVE-2007-5659 (Collab.collectEmailInfo) in Adobe Reader to execute a stager. The stager is designed to download and execute a second-stage payload, as indicated by the ClamAV detection name 'Pdf.Dropper.Agent-7325973-0'. The obfuscated nature of the script and the exploitation of a known vulnerability point to a malicious dropper.

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: Pdf.Dropper.Agent-7325973-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7325973-0
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` `79f20d251593753a4d511347680c169f4173f7dea55393e4c925254f2e76ce6e`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	76648 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` `35fd1dee3abe3fc8005a5e318eaf597cce9c25eb43d0a9aeb0c9df32a664b699`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1270 bytes

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