PDF malware analysis — malicious · e0557d1f63434457

MALICIOUS

PDF

13.4 KB

MD5: 6239abc3386d9e66b88c5f6eebc3123d SHA-1: 599df53cc0cec70bd4bfdba2a32c1cfc1b63dcf4 SHA-256: e0557d1f6343445746daf5097d48a81425df20268a8d9f685a2180e339fc19fe

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, identified as a binary-XOR stager, which exploits CVE-2007-5659 (Collab.collectEmailInfo). This exploit is designed to decode and execute a second-stage payload. The presence of multiple PDF-specific heuristics, including obfuscation and JavaScript execution, strongly indicates a malicious PDF designed for exploitation.

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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0049_000.js` `73091cfda4364175d10bbf11a2abd1bf2e5751ac062dc8512a3f2513a9c9ad96`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	79816 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` `0763c6e73048e30deca834065d9b02da398cd9f62e481cf18a617ddd9f6b1f14`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1336 bytes

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