PDF malware analysis — malicious · b97632d804c4b386

MALICIOUS

PDF

5.1 KB Created: 2011-04-05 23:46:28 Authoring application: bgffub lodfab

MD5: 4eb918688d96779c501c04ca99d23321 SHA-1: 3216a4559225c45e9f803ec8625581d99c2fddb5 SHA-256: b97632d804c4b3867bb6775ec56499001763d4644b6b7a58054a9bd0ac382b94

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is executed due to XFA form processing. The heuristic 'PDF_UNESCAPE' indicates obfuscated code, and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' confirms a script payload. The JavaScript file 'stream_001_off00000340.js' is the primary artifact. The script's purpose is to download and execute a second-stage payload, though the exact URL is not directly visible in the provided evidence. The confidence is high due to multiple strong heuristic signals.

Heuristics 7

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_001_off00000340.js` `4d930a01d786d404baf76ff7b2d9b52ae2000bc49e07f20ac16a8b5eb27872ff`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x340	55138 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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