PDF malware analysis — malicious · b5ec23fcd693f0e6

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: 345e855b3be53a5898d361b7ce997255 SHA-1: 8bae76b9d9656be6f35d331a962d86a23229e563 SHA-256: b5ec23fcd693f0e6535e53bc8eb9dcffb8d7af682308e9a3569a131dd27ef7ff

346 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript that is triggered by the OpenAction feature, exploiting CVE-2007-5659 and CVE-2008-2992. The JavaScript uses eval() and String.fromCharCode, indicating obfuscation and dynamic code execution. This pattern suggests the script is designed to download and execute a secondary payload, as indicated by the ClamAV detection of 'Pdf.Exploit.Agent-35384' on both the original PDF and an extracted artifact.

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` `bd1fbd56b43420b67528442a864b1d9acf1ee28bf76a6ea1fe8b16a4889b104e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	14870 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` `f81167645a0f8c48d09c2ddf2bf6e2f0b9504e1ec0a8e4d910a9525b07c73b22`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x42F	4407 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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