PDF malware analysis — malicious · 8c4c64ed84ccc9b4

MALICIOUS

PDF

3.6 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 577960e2701a7ddee15f9cd3f96c63d0 SHA-1: bc85c8a86bd8aa11940f2d0481aa34249aa3dbb8 SHA-256: 8c4c64ed84ccc9b41bfb5d99202d314015632d039433f467baba28a61494499b

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains multiple JavaScript-related heuristics, including PDF_JAVASCRIPT, PDF_JS, and a critical CVE_2007_5659 firing related to Collab.collectEmailInfo. The presence of eval() and String.fromCharCode indicates obfuscated JavaScript is being used. The extracted artifact 'numeric_charcode_stage_000.js' is likely a deobfuscated stage that executes malicious code, potentially downloading a further payload. The OpenAction trigger further suggests automatic execution upon opening.

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)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
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_obj0013_001.js` `dc5d7ef74043050baf1f069a3aaa5f2f1e1ab705298d6fdc84dd01a4bdfa82ad`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	14227 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `f32dd4720fdb1c970a20e70b73983bf28a4c22e5c8c07475b9b755fc21ae3c84`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	4260 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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