PDF malware analysis — malicious · 51bb8d71b7b031f1

MALICIOUS

PDF

2.3 KB

MD5: da83a2a1fb1f438e6db852ab1b3592e9 SHA-1: 11aceb81f090b835dfd4302148055d2ce12495a1 SHA-256: 51bb8d71b7b031f1b23b124a412e50c36fe9d99dba748800979bafa58195a3b5

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and utilizes eval() calls, indicating malicious intent. Specifically, the heuristics indicate exploitation of CVE-2009-0927 (Collab.getIcon) and CVE-2008-2992 (util.printf) to execute this script. The script's purpose is to download and execute a second-stage payload, as suggested by the ClamAV detection on an extracted artifact and the presence of deobfuscated JavaScript. The attack pattern is consistent with a malicious PDF dropper.

Heuristics 8

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (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 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.
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_obj0009_000.js` `4d417961963c36991b88f5c7071c1c45cca46d0448603c0aab9f9fc781c6ce66`	pdf-javascript-stream	PDF /JS object 9 at offset 0xBC	20618 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `b46052c4a4f0f47dae85415d6311ea0becaff3d345d122d366c1ec3dec3387c8`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xFC	5639 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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