PDF malware analysis — malicious · 1b3e33e5f45f183e

MALICIOUS

PDF

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

MD5: 0d18dfb4f9eb9422928521896582647c SHA-1: 74e370e79a8dd9b2748905d95623614f6bd2a71d SHA-256: 1b3e33e5f45f183ebf6809114a2118c85ac2565ff267dff6a8e84bfbd367a04f

346 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes the `eval()` function and exploits known vulnerabilities (CVE-2007-5659 and CVE-2008-2992) via `Collab.collectEmailInfo` and `util.printf`. The primary function of the embedded script appears to be downloading and executing a secondary payload. The ClamAV detection of 'Pdf.Exploit.Agent-35384' further supports its malicious nature.

Heuristics 10

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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-35384 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35384
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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)
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_obj0013_001.js` `e0b3475cb129a029980364e3e639f0abf26efc580b0c37f151bd1d710bfac65d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	15174 bytes
Detection ClamAV: Pdf.Exploit.Agent-35384 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `597694b8b8629501b9b9047b1949e7b8ead03067f773a6a9c1a9b4815e33dec2`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x42F	4503 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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